Really fun game, but it didn't take me long to figure out that the enemies spawned in waves and once I did I just waited for all of them to spawn before walking in circles until they all clumped together and then took out the entire wave with a single shot. Perhaps a different enemy spawning system that can't be exploited although I wouldn't know what to do considering enemy spawn amounts as a difficulty curve isn't as effective in a game where enemies can kill each other. The sound design was nice but the lack of music makes the sounds somewhat jarring. Overall, great prototype!