Here is a game I made entirely by myself, start to finish, in a single weekend for the Global Game Jam. I made it using Unity Pro, Luxology Modo, Photoshop, Cubase, Sound Forge Pro, and Adderall Pro.
Controls: WASD or Arrow Keys to fly around, and Space or LeftMouse to…. use your… weapon.
(The controls can be configured in the setup screen, and joysticks/gamepads are supported too)
Mac OS X Build
Tested on 10.8.2, may work on earlier versions
Tested on XP, W7, and W8
Original Soundtrack (MP3)
Watch out, the difficulty ramps up very quickly in the second half (after the mountains!)