So you're a robot guy. You want to shoot other robot things. The context is flimsy. You have no idea why you're shooting, but it doesn't matter because shooting is fun. This is the basic concept of Effing Machines.
As dumb as the premise sounds (and is) Effing Machines is fun, mainly because it has a cool feeling of being overrun. There are so many enemies onscreen at once that the game feels frantic. It's sort of let down by caving to the bloody endless gamification that lurks behind seemingly every flash game ever made - collect point and upgrade you weapons! Keep playing our game in a mindless pokey-esque trance... please?
But still, a decent amount of fun. Plus - robots. Amirite?