- 

the boss' prize, which is dropped where the boss dies, does not have an intangibility time and could unfortunately remain stuck inside the floor or wall.

this is more likely in the FIRST boss and very unlikely in all the others. sorry

- some bosses have an inconsistency between the point where they suffer the impact with the hitbox and the point at which the particle of the hit suffered appears

- There are inconsistencies with the backgrounds in some stages. in particular in the third and last (ninth stage), indeed the ninth stage has no background at all in the first stanzas. I ask for forgiveness

-  do NOT GO DOWN!!! the elevators that appear after defeating the bosses because otherwise you will be stuck in the empty room and 

missing a level reset/restart button you will have to turn off and start again from the first level