bosses are good but it feels impossible to not take damage from enemies since they end up right against you which can be rough. if that isn't your intention it could be fixed any number of ways : telegraph their attacks, knock back, more invincibility after being hit, have a dodge roll or something
also the numbers for switching abilities is not really convenient. it makes the second phase of the second boss difficult because it requires the big jump to hit and your looking for the key trying to switch to fire ball while midair (i just end up taking damage whenever using the mid air stab attack)
liked the idle animation and the story and music where nice