Remix and add yourself. Any damage you cause should give an amount of EXP that should, but doesn't have to be, proportional to either how strong your attacks are or how strong the enemy is. Try and make some attacks that consume some of the XP bar, but not enough that it would go down... because it can't. You can change the music if you want.
I forgot to mention that the attack kind of straight up killed, like a lot. I would show every atom of your body being spread throughout the universe, but i'm too lazy lol
