Nice little thing here. The two problems so far are it is too easy think health slime is an enemy and murder it. Could do with making the player unable to murder it, or stun you in the first encounter with it so that it heals you before you regain control. Second the nightmare wolf boss fight has a bit of jank, as in when the boss teleports to catch up, the player locks up for a bit, and sometimes this freeze lasts long enough for it to grab you while you are frozen as it always seems to try and grab you the instant it teleports.
edit: Also at the end of nightmare wolf when you jump to grab the watch, you can still hit the death plane and die, forcing you to do it again.