This is fun! I like the idea of mixing rhythm game with other games. And it's also in theme (Over the top)
The music is original and well written. The handdrawn style art is beautiful, stone is cute ! It has emotions (like it becomes angry when rolling down, ) And it gave me a little surprise when rock start chasing .
Only problem might be the control, it has a little latence when I change character's direction.
And since this game has 2 phase, maybe add a separate help text to decribe how to play the rhythm game part ? (I found out that it was a rhythm game by dev's comment.)
Viva la cute rock!!