You've got some good elements here, especially a quirky setting and an unusual character.
The controls could use some refinement. The player's attack takes a long time to wind up.
Unfortunately I got stuck after beating the golden boss. I'm not sure what I was supposed to do next.
I would also like to know more about who or what the player character is supposed to be. It appears to be some kind of machine. That could be an interesting story to tell!