I attempted to create a fast arcade game in 64x18 pixels, and I'm pretty pleased with the end result. I also took "Unimportant" as a literal theme, and that took me to the Groundskeeper concept. A seemingly unimportant job, but don't underestimate it ;)
Game is done in HTML5, and this time I took the time to make sure audio works in more then just Chrome (but use Chrome for best results!)
I did pre-scaling on the graphics, so altho they are in 64x18 resolution, they are scaled up to look good in your browser and not see the ugly anti-aliasing that browsers automatically do.
Cool! I racked up 36 points by standing to one side and holding down the shoot button facing the other way. Then one of those black things stopped my exploiting sneakiness. :)
+ I like the lightning effect
- it would have been better if you had made it even wider
* add more enemy types, and the possibility to switch weapons (borrow some stuff from Super Crate Box)