I loved the the atmosphere, the colors work great together and the music and sounds are on point.
The combat was good for the most part, I feel like the dash can be more snappy and fast, and while jumping the player falls too fast and it feels strange. I died at the boss and needed to restart, so I came back for one more try but fell into lava near the end and got instakilled, that felt bad. maybe falling into lava should be less punishing.
the upgrades really pushed me to try again, and I also felt like I was improving my skills every try.
loved the game, it was good fun. great job :)