Sorry for duplicating, but I guess I should be writing here, not sure :D.
Very nice and very aesthetically cohesive. You have some pixel art assets together with higher resolution ones, but you make it work well together.
Music is also really fitting, and the theme is just perfect for this game. Don't die, or else...
The only thing that caught for a couple of tries was the lack of feedback on enemy hit. Some kind of particle would be nice there, I thought my fireballs were actually not reaching the enemies :D.