Neat game, I like that the buffs stack permanently. Some things that should be good, like speed up, begin to have drawbacks (too fast is hard to control!). Although, it makes the starting hand really important, I had my best runs when I reset for a good starting deck. It would be nice if I saw which bad cards were in each draft, since I could then make a more reasoned decision.
Ok, after playing a few more times (and beating it), I think it's very shallow strategically as a deckbuilder, but I like the weird outcomes from permanent buffs. There's a dominant strategy (get multishot, health up, and heal early) but I had fun finding it. Because of the enemy AI, I tried to avoid ever jumping, since it was far easier to manage the slimes when they stayed on the ground. This left me opting out of every single movement card.
The art is cute, but not as legible as it could be. I'd like to see more feedback on getting hit. The lighting is very nice. I'm not sure the music fits the tone. My only note on SFX is that the player getting hit should probably be a different sound to hitting the enemies.