Cool game!
Could have really benefited from some invulnerability frames though. At one point I had two of the big guys alternating shots at me and I was basically stunlocked and could neither move nor shoot, so it was pretty much a game over.
I'd recommend refunding some energy when you kill an enemy too. It rewards accurate shots.
I'm unsure as to how to "win", because I was running around clearing out rooms for 5 minutes but the fountain thingy always said not enough energy routed.
A solid entry!
Also please play my game! <3