Neon

Neon is a simple, retro space shooter, using just the mouse to control. I've often had serious problems with these kinds of controls, just because it's a bit difficult when you're forced to always move the ship if you want it to aim in a certain direction, but hey, that's the game. And it's quite fun - Gprime bills it as "a flash version of Geometry Wars" - to be honest, I've never played Geometry Wars, so I have no idea if this is hyperbole or not. Probably, if I had to guess. But it's still worth a few minutes of your lunchbreak, so head on over and check it out.