The UI elements could use some work; I think I was able to figure out what button was supposed to do what, but using the default buttons in Godot with text would at least make it clear what the buttons are meant to do. I also think some audio/visual feedback when you hit the boss would be nice., I generally had no clue when I was close to killing the bosses. The implementation of the theme is reasonable but I agree with some others in the comments that the attacks could use some more telegraphing, especially when it's easy to lose track of the multiple copies of the player. The dash felt nice to use though and the controls were decent (not sure why WASD didn't work for the other commenter, it worked fine for me)