Pretty neat! There's a good concept in there with picking up the powerups only when you're a ghost.
I found I had very little time to collect anything before the circle shrank too much. As well, I had to stick to one area so that there would be anything to loot. That on its own can lead to some interesting strategies, but because you're also consistently taking damage from the curse it results in being stuck in one spot waiting to die. Since enemies run away when they get hurt, it's really, really tough to defeat them without straying from vital resources. Even if I complete a full wave before death, the circle that results feels pretty small to start.
Anyway I don't mean to sound too negative, it's a fun experience! Just a bit too difficult for me to get very far, the best I could do was wave three. Great job overall!