It took me a while to realize how to get exp since I kept getting wiped out by bullets. The indicator that shows where the enemy is located is useful but it still felt a tiny bit frustrating to get killed with no experience a bunch at the beginning without understanding why. I did like your upgrade system, though it would be nice to earn exp a bit faster in the early game or to have smaller enemies to fight before taking on the big guy so you can get exp from them first in a slightly safer environment. Nice job finishing this in time!