I think this might be my favorite game I've played so far this jam! The art is very nice and has a unique style, and it reminds me a bit of some of the pc games I played as a kid.
The character is a bit slow but I don't think that's a bad thing by any means, the game feels very chill and relaxed and it fits the mood. The powerups also feel great to use. The moveset makes the game feel like Celeste but a metroidvania, and who wouldn't enjoy that? (Especially the final boss, whew) The difficulty also feels juuust right. Although I was a little confused at first why there were both bright white spikes and then harder to see thorns.
There's also a small bug where when I rescued the cat in the hall with the 4 ceiling spitters in a row, I died and came back, and the glass had respawned despite the cat not being there. I broke it and it yippeed anyways lol.
The map was also somehow perfect, I never felt completely lost like I needed a map but I also never felt like it was too small.
I think the sound that plays when you discover a hidden area is really nice, I don't think I've seen that in metroidvanias I've played and it definitely adds a layer of satisfaction!
Last thing I'd add is that I don't think there's a reason to lock the player in place when the game ends if there's no ending, I wanted to go find the other two yarn I missed :(
Super fun game!