Hi, great job. I liked the theme and the effects you put in.
I would offer two suggestions. I think the monsters hitbox should be disabled when he's dying. Since the game is essentially "timed" the player wants to move as fast as possible and running through a dying enemy and then dying yourself is a little frustrating.
Also, if you are going to have a timed game, I think the slow moving platforms need to be reworked or reset somehow when you die. I ran into a few situations where I just died because the slow moving platform was out of sync with my run. I had to wait for it to come down and just died.
Cool game though otherwise. I had fun!