I liked the concept.
However, I could not complete the third level, I know what to do (I think) but the challenge is a little too hard to complete. Jumping and attacking was hard for me (I am a controller player nearly exclusively, very challenging to use KBM). I you simplify this (maybe by removing physical collision to keep only hitbox on hourglass so they can be on the floor perhaps? I let you the judge of how), I may continue (and finish?) the game.
I still enjoyed playing it, thanks!