Voices of the Void a free (likely while it's in pre-alpha) light simulational game about receiving outer space signals and recording them to sell. You use the currency to clean up, upgrade, and decorate your small facility while moving around the Swiss forest valley you're in to repair and upkeep the satellite dishes that make the operation function.

It sounds very purely simulational, but there are a lot of secrets and interesting signals that are more than signals. It's also an Unreal engine game, but features a lot of Source engine love, for example the art style is reminiscent of Half-Life 1, all of the sound effects are EXTREMELY Source game nostalgic, and there's crouch jumping.

Azimuth

Azimuth is a metroidvania game, and something of an homage to the previous greats of the genre (Super Metroid in particular). You will need to pilot your ship, explore the inside of the planet, fight enemies, overcome obstacles, and uncover the storyline piece by piece. Azimuth features a huge game world to explore, lots of little puzzles to solve, dozens of weapons and upgrades to find and use, and a wide variety of enemies and bosses to tangle with.

It is open source and available for Windows, macOS, and Linux.

Spheres of Chaos is an old asteroids based game that really ups the ante on trippyness and cool sounds

I should warn you though that it is very flashy, so epilepsy warning is in order

Sulphur Nimbus: Hel's Elixir, a $6 (currently) game on itch.io. It started from the idea of an MLP fangame, but early in development evolved into an original setting.

This is a 3D physics platformer adventure with an unhindered flying character. Your hippogriff, Sulphur Nimbus, is an aerial photographer aboard a cargo ship, which is passing a mysterious atoll on the way to their destination. The crew want you to get pictures of the island, which has a castle that's been abandoned for decades. Unfortunately, after flying over there, a nasty storm builds up and you get zapped by lightning. After a flashback tutorial on how to fly, you wake up on the island shores, your wing is injured, and you have to run to safety, finding out this place is dangerous... so dangerous a resident dogicorn (like a hippogriff, but it's half dog and half unicorn instead of half bird half pony) has to rescue you when a lovecraftian horror tries to take you down into presumably Hel. Waking up in a castle room, your wing is healed, and you can fly again.

Now the game begins. Clear the boss monsters and rout them out of this island, area by area. Break the curse that binds you to this island. Find out what happened here.

What's unique about Sulphur Nimbus is the movement. Running, fighting, and jumping has physics to it, allowing for some parkour stuff to be possible, like running up steep inclines and wall jumping. Flight is realistic. There are no arbitrary limitations, other than a regenerating "flap" stamina. If you can get enough speed to take off, and if there's enough room to maneuver, you can fly. Level designs include lots of caves and enclosed spaces, but also lots of open areas, so being able to fly is a requirement to get through it, while also a challenge. While the game is designed for kb and mouse controls, honestly, a gamepad works very well with this game and is preferred. It also is cross platform, as it is made in java, and includes Windows, Mac, and Linux. The source code is on sourceforge and allows you to build the whole game yourself if you are so inclined.

There's no other platforming adventure game that attempts this, and I have tried every "become birb" game out there. They all are either bird simulators or use flight as a fast travel, but not as a core gameplay mechanic like this.

It's a Block Pushing Game is a sokobanlike from the creator of Baba Is You. It's relatively short but has multiple novel mechanics. I enjoyed it enough to create a curses client for it.

PS: If you like Baba Is You, Hempuli publishes multiple new games per month, mostly clever sokoban-likes, at https://hempuli.itch.io/

Lorn's Lure (currently demo only, releases in 3 weeks)

An android is led through a vast structure by a glitch in his visual system. Lorn's Lure is an atmospheric narrative first-person platformer with novel climb-anything mechanics and modernized retro 3D graphics.

Our Adventuring Guild doesn't look like much on its cover but it scratches all the management sim and tactics RPG urges that I enjoy, while also having some surprisingly cute writing (while still mainlining the classic fantasy RPG themes)

Rags to Riches C64

I found this game a few years ago after playing a remake on Pico-8. The premise is youre an unhoused person who just got out of jail, and you have to collect cans and change, find work, get an education, and a nice job, all while avoiding several hazards like muggers and the IRS.

I found it surprisingly addictive and very fun.

CONCLUSE

Concluse is an atmospheric horror game which features puzzles, outstanding cutscenes, and something a little twisted..

This one is free! Unfortunately a lot of my niche games are horror, not sure how broad of an appeal that is, but hopefully there's some horror fans here :^)

Encased is a CRPG, heavily inspired by the classic Fallout games, bringing it's mechanics into the modern age. It's story is based on the classic book "Roadside Picknick" (known for being the inspiration of the Stalker series) and is very well written. It has a story narrator, similar to the Divinity: Original Sin games and a very in depth character creation. At the start you choose a department of a research company to work in, which will change the way you interact with many characters, adding some replay value. Anything more I could say would be a spoiler, but the entire beginning (first half to one hour) is an absolute banger.

It's my favorite indie game of the last few years and at the time of writing this, it is currently 90% of on steam, an absolute bargain

Toodee and Topdee (559 reviews)

Puzzle platformer/block pushing hybrid

The 2d platforming world and top-down world have smashed together. You control one hero from each dimension, who share the same space in the levels. You switch between platformer and top-down modes and must get both characters to the goal. The boss levels are hard but very cool, combining action and puzzles.

Also features local 2-player co-op and a generous assist mode.

Evochron Legacy if you want a space game that also lets you fly down onto planet's atmospheres, with the appropriate air drag limiting your max speed.

I should probably try playing it again sometime, it's very rough around the edges, but can be fun for people that enjoy ship piloting in space.

Copy Kitty: https://store.steampowered.com/app/349250/Copy_Kitty/ has a demo

Fun elimination platformer. If you wish Kirby did more with the power mixing from Kirby 64, you'll probably like it.

Ara Fell

The whole things just a massive labor of love from a relatively small indy studio. At one point it was an RPG Maker game that was delightfully well polished in terms of story, art, and environment. After the devs got tired to rpg maker limitations, they ported the whole thing to Unity and re-released it as a free Enhanced Edition update. Childhood me played the shit out of GBA Harry Potter and the Prisoner of Azkaban and it very much scratches that JRPG itch.

Underhero is a RPG. There is (bad) 2D platforming and an interesting blend between turn based and real time battles with decent amount of player expression, but I find most interesting the writing and scenarios you will find yourself in during the game. You play as an Underling after the Hero has an unfortunate accident after all, and while technically a silent protagonist, all entries in the journal/hint system/to-do list are just brimming with personality.

I swear I first saw this game in list of "Paper Mario-likes", but I can't find a single video with that topic that mentions it, and now I realize that it only has like 600 reviews on steam.

Achron A RTS with time travel. You can actually send troops and orders in the past to change the outcome of the battle.
https://youtu.be/b6YYWCW1wVs

It's a shame it never got big. The time travel mechanic is awesome.

Aw yeah! This is where my knowledge of absurdly good but extremely niche games comes in. I think I'll make multiple replies to this comment.

Chronosphere

Think enter the gungeon combined with superhot, but simplified a lot. It's a turn based bullet hell, and an excellent arcade game playable in the browser.

EDIT: I'd also like to take this oppurtunity to talk about flashpoint. Flashpoint is a massive archive of basically every flash game and animation, and you can even play them again.

However, in addition to flash projects, I also noticed that flashpoint also archives HTML/HTML5 games... but only a subset of them. Although flashpoint's primary purpose still is as a flash archive, it can also be used as a curated list of HTML5 games.

Here is a website that lets you search the flashpoint database

Astalon: Tears of the Earth. Really fun 8-bit roguelite metroidvania where you swap between characters to access different parts of the dungeon.

I recommend Scavenger SV4 It's a very unique game where you send a rover down to a planet to grab what alien artifacts you can before your radiation exposure gets past the point it can be treated. You can bolt some of them onto your rover to make it better and send it down again. It also has several hundred different endings that are decided by how much radiation you absorbed and how much loot and what loot you brought back.

Infested Planet

RTS. Kind of reminds me of the ground comabt from Star Wars Empire at War crossed with Starship Troopers. Command a squad of space marines tasked with battling an overwhelming alien horde. Pretty fun campaign (if a bit of a predictable story), plus an endless mode. Not exceedingly difficult, but definitely challenging enough to make you think tactically and keep you on your strategic toes. Somewhat limited replayability makes the sticker price hard to recommend (unless your bread and butter is RTS), but it regularly goes on sale for less than $5, which it is absolutely worth!

NandGame is a browser puzzle game, where you start of by building basic logic gates from relays and progress from there all the way trough processor design to compiling high-level languages. It does not hold your hand too much, but the invidual puzzles progress so incrementally, it feels almost magical how easily you learn to build computers and compilers.

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Spin Rhythm XD is a highly enjoyable rhythm game where you spin a wheel with two colors and match them with the beats on the game's rhythm track.

Here's a description from Steam:

Enter the Rhythm Dimension. A homage to classic arcade rhythm games (Guitar Hero, DDR), with a modern aesthetic and soundtrack. Match colours and beats, spin, tap, flick and flow through the juiciest beats in the universe. Supports multiple control styles including MIDI DJ gear on Steam!

Edit: at the time of writing this, I didn't realize that this game had 3.5K reviews on Steam, but literally nobody I asked knew about the game, so I guess it kinda counts.

Nexus: the Jupiter incident. It is a now a bit old tactical space combat game with a big focus on the narrative. It's awesome, but I never see it mentioned anywhere.