hitting even baseline damage zone is too rough and quickly became uninterested. i recommend making the damage zone fairly cheap up to 1/4 to 1/3 the size of the circle. then, allow increase of the critical zone, introductions of new critical zone, a possible non centered bonus zone, ect
start with a much lower 'cursor' speed as well. its way too fast starting out and should be able to be upgraded. maybe an unlockable power up to slow time later on for specific hits?
combos also made no sense as I got 2 hit combos off one press. may be a bug there.
regardless, very cool concept, could be hella polished, but as it is a bit slow, uninteresting, frustrating, and not quite fun -yet-
6/10