Stopped in stage 3, it's hard which is a good thing but I'll probably need some more involved time to manage to beat it, the stage 2 was already hard to me, whenever I lose the rythm it takes me a ridiculous amount of time to get it back.
The game is very good, the gfx especially and I particularly like the skeleton dancing animation, they look hilarious, and their animation when you defeat them is good too.