One of the best games I've tried so far in this Game Jam !
I absolutely love the boomerang mechanic, and I'm curious to know how you synchronized the jumps with the music's beat ( I wanted to do something similar in my game, like having camera shakes in rhythm, but I didn't quite manage it, so I ended up removing the camera shake ).
PS : The Boss is a little hard to beat, but I finally got it with patience...