I think this is a very cool concept! The only way to take out the enemies and get yourself out of danger is to put yourself into more danger. I think it could use some balancing, though, since I was able to survive just by running around the arena without triggering any bullets. Of course, it's hard to perfectly balance any game over a 48 hour period. Still, I liked the different abilities the ghosts had. Maybe if they were a bit faster or more ferocious when they weren't shooting, it would motivate the player to make them shoot so that they could gain some distance from the ghosts. Good game!