The atmosphere on this game is very good. It makes it stand out in the crowded sea of arena shooters.
Seconded, the music is great! I also like how the sound effects are very subtle so it's a pretty quiet, organic and relaxing game.
I'm not a big arena shooter fan (didn't like geometry wars, for example) but I really enjoyed this (as it isn't noisy and full of explosions and flashy lights). A bit short and easy though, but very nice! congrats!
Yeah, I'm not a huge fan of that type of arena shooter either, which is why I wanted to make something different.
About the game's length - I wanted to keep it relatively short so that more people could get the game's message.
Thanks for your comments!