Loved the aesthetic, the effects and everything were great. However the pacing for me is all over the place. I was dead within the first 2 seconds playing for the first few tries then kept getting ambushed by spawning enemies later on (maybe have let the player know if enemies are spawning under them). I would say for your next project work on pacing, have a slow ramp up in difficulty so the player can get used to the game before challenging them.
Also I was able to "cheese" the game by standing in the lava which only dealt 1 damage and allowed me to stand still and let the enemies to chase me to their demise.