Hi, I loved the light effect on this one. It created a very cool illusion as if there were very high and dark walls. I think the idea of exploring without knowing what's behind some walls is really cool, it keeps you more focused. Sometimes my melee attack didn't hit the enemies for some reason (I think there's a problem with the collider's shape maybe (?)), but it didn't happen quite often, so it's fine in the end. The music choice is really fitting, and all the sprites are very well done. I love that the player's sprite updates on each upgrade as you mentioned, it really makes you feel more powerful. Overall I really enjoyed playing it.
Good job and good luck with it! <3333