Most of what I play is indie and choosing a favorite is too hard, so instead I'll go with biggest playtime. Antimatter Dimensions, also on Steam, has quickly shot to having the highest playtime of my Steam library. It is an idle/incremental game. Bonus points: free! Most of the idle/!incremental_games@incremental.social I have played have been free in the browser without IAPs, and seem to have been made by one or a few people.

Not counting that, I'd probably have to go with Stardew Valley.

Live for Speed

I've been playing it on and off for over 20 years now with some definite highs and lows but I have nothing but respect for the devs (3 people) and community. It's not on any store fronts and they just do their own thing.

LINK

super meat boy

I really like Isle Wars and Scorched Earth

NaissancE

Clair Obscur: Expedition 33. If that doesn't count. Will....HoloCure or Noita or Parking Garage Rally Circuit.

Clonk Endevour is not my favorite game, but I played it a lot with friends when I was younger. You can play with 2 or even more people, with just a monitor and a keyboard! Also it's so old it should run on any potato.

edit: real answer is Slay The Spire

edit2: ah shit now all of a sudden all the good indie games I played pop up in my head. Project Kat I enjoyed. Synthetik was awesome. Caves of Qud hasn't been mentioned yet (didn't play it much though).

The Binding of Isaac is already a famous title that has influenced so much of the roguelike/twin-stick-shooter genre. This game has permanently altered my taste in video games.

The game I’ve enjoyed as much as TBoI is Tiny Rogues. It’s much smaller, but still fantastic with rich build variety while never losing the need for skill and good reactions.

Stolen Realm is a turn-based tactical RPG that takes place in procedurally generated dungeons that play like little roguelike runs with overarching character progression. It’s multiplayer, but you can also just control up to six characters on your own too. It does eventually feel pretty repetitive and there are points that seem impossible to win, but it’s a unique game where you continually build that roguelike power fantasy and just progressively become more powerful to the point of it feeling game breaking.

Going Under is an adorable roguelite where you fight through various levels themed around a blend of corporate stereotypes and fantasy creatures like a crypto company run by skeletons or a delivery company run by goblins. The combat is a vaguely souls-like with an emphasis on weight and timing, but your weapons are office items found in each room that break down very quickly.

Webbed is a cute puzzle/platformer where you play as a little spider on a quest to save your spider boyfriend. The main gimmick is that you can shoot webs to create platforms, pull things, attach things to each other and more. It’s a short and sweet game that’s still decently challenging. It’s the only non-roguelike indie I recommend and it’s that good that I love it despite it being in a genre I rarely play and almost never finish.

Monster sanctuary (turn based monster collector) and Roboquest (arena shooter) were a couple from recent years that stood out to me

For older games nethack and dwarf fortress are great if you can look past the graphics

Top of my list right now is Vintage Story! It's like a serious version of Minecraft, with more focus on realism.

Gotta go with Dwarf Fortress. Been playing on and off for the past 10 years at least, it's just endless !!FUN!!

Check out frog fractions!

Can't believe none of these haven't been mentioned yet: Starsector Kenshi Graveyard keeper Battle brothers Ghost of a tale

I loved a tiny one called The Last Day of June.

It was on PlayStation Plus and it really had a great story.

• Vintage Story
• Project Zomboid
• Stonks 9800
• Zero Hour
• The COMA
• Phantom Brigade
• SCP 5K (still in Early Access, long way to go, rip lol)

Undertale

Saw someone else out urquan masters, so I'll put Caves of Qud and Rain World. they both of some of the best pixel art ever, and caves of qud has some the most dynamic story telling in anything I've played

The vast majority of my favourite games have been listed, many multiple times, so I'm gonna go with some I didn't see, though I didn't look exhaustively, here we go:

Horace

Quite a hidden gem in my opinion, almost no one I mention it to has heard of it. 2D platformer with an amazing story and some interesting gimmicks. One of the most surprising and unforgettable indie games I've played.

The Messenger

Ninja action-platformer that is way more than it first appears if you stick with it. Hilarious writing, great controls, and amazing music. Genuinely one of my favourite games.

Yoku's Island Express

Almost entirely unique in it's idea. It's a pinball-metroidvania where you're a postman dung beetle, and it really works. Gorgeous world, super chill vibes, clever puzzles... What metroid prime pinball should have been.

Magicraft.

Swapper

Not my actual favorite, but it's very high on my list, and I didn't see it posted yet.

I really liked What Remains of Edith Finch.

It was more of an experience and really struck some emotional chords, leaving me write emotional at the end.

Really beautiful and melancholy experience.

Some I really appreciate that I'm not seeing on this list:

I'm currently enjoying Blue Prince which is a fairly new rogue-like puzzle/mystery game it's hard to explain without spoiling but it's worth looking up.

Portals of Phereon is one of my absolute favorites. It's a fairly deep tactical RPG thing with loads of replayability. It's kind of like a Pokemon x FF Tactics but with monstergirls and it's also currently free while it's in development. Be aware it's extremely NSFW and horny, which I suspect is the main reason it's not as popular as some of the others listed (IE rimworld, stardew valley, etc.) however the horny is such a key point to it's original gameplay and world-building that it wouldn't be the same without it.

Thea: the awakening is a decent tactical RPG. I love it for it's original battle mini game, crafting system and world-building. It unfortunately has some balance issues and jankiness that prevents it from being an all time favorite, but it's definitely one I would encourage at least trying.

Thought of a few others:

• Reus (2nd one's alright, first one's excellent)
• Library of Runia
• Book of Hours
• Kenshi (saw it listed one other time, but it deserves a lot more love)

Anything of Soldak - https://store.steampowered.com/franchise/soldak/ : 2 series - space shooters Drox and hack n slash Dins - Super coarse graphics, action, fighting, but their living worlds, like nowhere else. No other game where worlds freely grow based on player actions. Did You ever left main quest for exploration, lvling up or side games, oh well, here, world will not allow You to, as enemies won't stay idle or wait for You, they do their business.

Orb of Creation - https://store.steampowered.com/app/1910680/Orb_of_Creation/ Semi-clicker (intense clicker, not much of idle) and immersive mage simulator, where You don't make Your mage-avatar, but are the mage. Still beta, but already big.

Can't really add much to all of the great games already mentioned. But I'll add one, because it was one of the best games I played in recent memory. Chants of Sennaar. Where to even start? Point-and-click adventure/puzzle game that is all about language puzzles. With great visuals and music. Really dig the eurocomics inspired style. I don't know why, but this game really touched me - maybe it's because the game is about uniting people in an age of discord.

Probably gotta be Starsector

The video that hooked me