use wasd to move, mouse to aim, and space to fire. UI: XP bar on top, ammo on left, and HP on right. when the XP bar fills up, you will get to choose from 3 upgrades to your character music: https://www.youtube.com/watch?v=vdZz_jSjXXo&pp=ygUZY3JlZGl0cyBzb25nIGZvciBteSBkZWF0aA%3D%3D
