Aim with your mouse and click to fire. (you might have to hold down the mouse) Change your bullet type by pressing the left and right arrows. Press "w" to rebuild the wall.
I was bored and this looked kinda cool so I made this. You can use these in games if you want but just make sure to give me some credit. BULLETS: 1. rapid fire normal bullet 2. rocket launcher 3. cool random plasma ball thingy 4. laser 5. nuke 6. bouncing bullets 7. Charge up Laser