Very fun & satisfying game. The brutal difficulty, "die and you restart" gives me some NES nostalgia.
I definitely want to try out a more polished version, if you plan on continuing work. I enjoy the brutal difficulty a lot. Some advice: it would be a lot nicer to give the players a bit more incentive. Better abilities, heal on kill instead of constantly losing health from everything, prevent the player from using abilities if the cost is higher than their HP, etc.