Okay - the game looks really amazing, despite looking like it was just something drawn up by a kid in a few minutes, the music sounds great and the boss fight was really fun too. The only problems are for starters, the gun fires lower than where enemies on the same level are, I couldn't read all the text in the intro because that Unity watermark on the bottom was in the way (that I don't fault you for though) and the game was a bit too short. Very nice though. I hope you continue making games! :D