Recommendation engine: Downvote any game you've heard of before
This might be a slightly unusual attempt at a prompt, but might draw some appealing unusual options.
The way it goes: Suggest games, ideally the kind that you believe would have relatively broad appeal. Don't feel bad about downvotes, but do downvote any game that's suggested if you have heard of it before (Perhaps, give some special treatment if it was literally your game of the year). This rule is meant to encourage people to post the indie darlings that took some unusual attention and discovery to be aware of and appreciate.
If possible, link to the Steam pages for the games in question, so that anyone interested can quickly take a look at screenshots and reviews. And, as a general tip, anything with over 1000 steam reviews probably doesn't belong here. While I'd recommend that you only suggest one game per post, at the very most limit it to three.
If I am incorrect about downvotes being inconsequential account-wide, say so and it might be possible to work out a different system.
For my it's Bone's Café.
Imagine overcooked but where you kill and use your customers as ingredients and can raise skeletons from the dead to automate as your chefs and servers. It's overall a very well put together game, especially for one with 240 reviews (total)
https://store.steampowered.com/app/1739070/Bones_Cafe/
I haven't played it couch co-op but the solo play has been really enjoyable
Dog Brew is also really good https://store.steampowered.com/app/2883280/Dog_Brew/
It's a cute game where you are a dog that brews beer. The game isn't complicated and its pretty short in playtime but it's $3.50 without a sale and its both cute and fun so I think it's very worth.
I also have a bunch more since I was just looking through my steam library so if anybody likes mine I can definitely drop more
Heretics Fork is a really good deckbuilding tower defense game https://store.steampowered.com/app/2181610/Heretics_Fork/
The hell theme is cool, the cards are interesting as well as the characters you can play and overall just a really high quality game that's underappreciated.
Oh wait I forgot my favorite of all. Although idk how popular it is because its not on a standard platform
Starsector: https://fractalsoftworks.com/
This game is incredible. Genuinely like probably the best game I've ever played. It simulates an economy fairly accurately (using the different colonies outputs and inputs to determine prices dynamically). In addition to this colonies can be hurt by you or other parties, affecting the prices of items on the market significantly so you can try to make your money on this margin.
There's space fleet battles with a complex ship modification system. There's colony management, it has an interesting early game and it keeps your interest as you get further in the game with new challenges.
It is $15 dollars and is technically in early access (which tbh is a steal). Though in practice my experience with it is not remotely reflective of it being early access. It's a little like how dwarf fortress was in early access (although unlike df before the steam launch there is a frontend that's really solid).
I also really enjoyed cult of the lamb: https://store.steampowered.com/app/1313140/Cult_of_the_Lamb/
It's a game where you are a little sheep creature that runs a cult. It's a mix of a management game and a roguelike since you go on runs to fight the games main bosses and get items to bring back to improve your cult.
Art style kinda reminds me of Klei's Don't Starve and is probably one of the most impressive parts of the game
Though this one is more well known. Still, I hadn't heard of it before so I think sometimes games with even a big following like this one can stay off the radar a bit unless they are truly massive.