Use W A S D to control the player, The player also looks at the mouse pointer. Press space The machine gun costs 20 Ching Ching. Don't get hit by the bad guys, and try to keep your health from hitting 0! to attack, and 1 and 2 to switch weapons. If you have enough money to buy a weapon and you switch to it, the game will automatically buy it. The katana costs 10, while the machine gun costs 20.
[UPDATES] I noticed the new mob ain't give ching ching. I fixed that.