Really cool idea! Reminds me of Astro Barrier from Club Penguin. Good job!
You Have One Shot At This
Shoot all enemies. Seems simple enough, until you realize you have nothing but a single bullet left in your revolver.
Note: if the controls don't seem to work at first, try clicking inside of the iframe that my game is contained in. That fixes the problem like 90% of the time.
Also note: I tried having the bullet be quick. I failed.