I like the artstyle a lot, but having one life feels a bit punishing. Maybe you could add heart powerups that can spawn if you roll them or something. I really liked how the music ramped up over time.
The difficulty of the game ramps up very quickly at the third key. We expected to balance it not so hard, for the one hit to work. But at this point, yes, the one hit is too punishing. Thanks for the coment.