I had a blast, I don't even know where to start.
So art style - you nailed it, considering it only uses 3 colors. At first it was hard to believe so I looked carefully on every asset to find the 4th color to no avail. Looks fantastic.
Gameplay - I really enjoyed the hat throwing mechanic, but I would like to have more control over the throwing part. For example sometimes I would like the hat to be thrown just a little further/shorter. I think it would make sense having "the longer you hold the button the further the throw" would be great. Otherwise, polished and enjoyable.
SFX - The sound effects weren't annoying and each fit into the game, however I would like some sort of ambiance - wind/thunder/rain or just background music. It felt a bit lackluster hearing nothing at times.
I also would like to complement the little story you got over there. I for one like when the story is evolving on other characters and not just the player itself, so big plus there from me.
Overall, great polished work with an interesting concept. Thanks!