Alien Alert 2

A single tank against an alien race, how long you can you defend your planet? A very small game I made in a weekend, which uses the Game Boy color palette and has a resolution of 64 by 64 pixels. It is nothing great, but I would still greatly appreciate any form of feedback. Controls: WASD to move. Space to jump/select. Arrow Keys to fire bullets. Ctrl with +/- for pixel perfect scaling. Alt to fullscreen. //note, you can change the game volume by adjusting the bottom number in the "Settings.txt...