I game I made in August 2012. Looking back, there are a few things I wish I could fix, but I think the editable became corrupt. Either way, it was still surprisingly enjoyable coming back to it 7 months later.
CONTROLS
WASD - move
Mouse - aim
LMB - shoot/purchase items
RMB - Use bomb
MMB - Place sentry
Number keys - switch weapons
Be sure NOT to click multiplayer, as you will be unable to close the game. Also, the multiplayer doesn't even work.