You are stuck in a big cave system full of bats, you have one gun and unlimited clips with 20 ammo. The bats that surround you are driving you mad, shoot bullets at the wall before you go insane. Move your gun with your mouse pointer, space to shoot. Key R to reload. Key M to turn on music (if I were you, I would turn it on straight away because it is good) and press key M again to turn it off If you want to play it again click the green flag twice. You're allowed to remix as long as you mention programmer_12345 in your instructions and also leave a link to my name. Credit to @programmer_12345.
