I love to see people try making proper puzzle games. I've tried it a few times before but I've always found it difficult to make fair puzzles under a time constraint. A couple quick comments (from having played world 1 only):
- I think there is way too much stuff here. It probably would have been better to trim down to the puzzles that you thought were the most exemplar (although I'll still try to get around to playing through everything!)
- The mechanics encourage too much indirection: one cow controls another cow controls another. The puzzles feel mostly like an exercise in running through mechanics in my head. I never feel stuck, just flustered when I lose track of the pieces in my head, and so there's never that moment of insight either.
- The tutorial is too much text. It is humorous, so I can forgive it a little bit, but it is not useful for teaching the player. I'd rather the game teach by letting the player experiment with the mechanics.
Hopefully this doesn't seem to critical. This is actually one of my favourite entries, and I'll definitely come back to try some more puzzles later.