Respect for attempting a metroidvania, you clearly understand the genre and how level design should work. I liked the enemies, I would've liked seeing more of such Cronenberg decorations around the levels. The game works fine, my only problem being the fight with the flying giant fused carcass. Because you can't aim up you can barely hit the enemy and even if you climb the little steps it'll fly above you anyway. Very thoughtful of you to let the player keep upgrades on death.