One Bullet (Lovecraft's Watermelon of Knowledge)

One bullet for each enemy. If you miss, you lose. It's actually awesome for aim training.

Controller is supported, dunno if it works on web though. 

Keyboard: Shoot with left mouse button, pause with space or right mouse button, quit with esc

Controller: Shoot with A, pause with B, quit with X. Press A during pause to toggle sounds

All is done by me, except for the laser sound, taken from a free sfx site.

Available for download,