Hempuli, the Baba Is You guy, puts a new block pushing game out on itch.io every week. I'm not exaggerating. And they're all genuinely different games from each other, each trying out a different mechanic, even if they are closely related.
The most astonishing thing about them is they're playable. I usually get about three levels in before I bail because it gets too hard, but I usually get a feel for how the game works, which is more that I can say about 90% of short indie games. Being able to think of this many decent puzzles consistently is genius stuff, in the original sense of the word genius.
The difficulty ramp up on the latest one,
Mayban is much milder, and I played about eight or nine levels. It's a good one to try if you're going to try any of them.
Why does he do this? I'm guessing either he's prototyping, it's fun for him, and/or he's just burning off some puzzle-making power gained while developing Baba.