Awesome prototype! You have the fundamentals down pat and the game plays well as a shoot-em-up. I love the attention to detail on the various weapons - the machine gun is overwhelmingly powerful, but I love the absurdity of a combat saxophone. Hopefully you can continue to work to put all these pieces together - now there's the enemies, health systems and guns, finding a cool way to set up a broader game would be the next step. Good work!