This was more fun than I expected. The simple geometric look goes well with the gameplay. Some constructive criticism: I survived pretty long and there were a lot of enemies and bullets flying and exploding at the same time, this meant that a lot of audio was playing. If you are playing more 32 audio files, unity cuts off additional ones. You could solve this by only playing a limited amount of sounds. So for example, if 100bullets are exploding at the same time, limit the explosion audio players to lets say 5