Pretty fun! Keeping stats when you die seems kinda OP; I'm pretty sure I would have beaten the game second try with the knowledge checkpoints from the first run without needing all the free extra stat boosts like that. Seeing other comments, however, maybe the way it is is for the best. I almost exclusively used the melee attack, reserving the ultimate for when I needed health and the ice attack just for using an enemy to skip up to an upgrade on the left that the jump timing was a little tricky for. It's a little weird that the ultimate doesn't hurt the boss, but it's probably a good thing that the frost doesn't freeze him.