Given the big swathe of posts about bad behavior from big companies, I figure we could counterbalance that with some positivity about stuff the smaller guys made that often costs us less too.
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.
Advent Incremental, I had more fun doing this around Christmas time but it is also playable off-season
The Idle Class, game was probably intended as cynical political commentary on problems with capitalism, but my oversensitive "dammit yes I agree with you but I want to enjoy a game without dooming about the world" self was able to play just fine without getting sad or angry or hopeless