Kind of....repetitive. But I was listening to this while playing megaman 6. Works perfectly on plantman's level. :/ Disturbing.
I really think you could have gotten a little more complex with your chord progressions, but then it would take away from the "retro" motif. I also would have liked a little more OOMPH from the drums. Doesn't have to bang the bass out, but....more presence. I liked it though. I'd totally drop acid to this.
Good job! ~1~