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.
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.