Concept seems decent in theory, but I'm not really sold on it. Winning strategy seems to be to sort of run up close for powerup, while shooting, back way off and dodge while shooting and power drains. Game is *very* glitchy. Got near the end and randomly thrown back the the beginning had to re-fight a dead boss and stuck on another dead boss' gate while the boss three areas away was flinging stuff at me and I couldn't get to it. Some more bugs besides that too but generally more visual.
Could be something here, but again, I'm just not sold on it as-is, sorry.