LOL Wut.
It was too easy. Upgrade everything, spam specials 2 and 3. Special 2 will rack up enough kills to refill your specials bar while special 3 shields you. By the time they cool down, you can re-use them immediately.
After about 10 minutes, I yawned and accidentally died.
Literally muted my computer's master volume. Music isn't bad, but gimme a break.