Thanks for the quick feedback. I agree it's very close to the original in it's current form. I'm going to try adding a few variations on theme but my music theory is pretty weak and I struggled just figuring out the original stuff, hehe.
Didn't notice any clipping when I was bouncing it, but I think the 909 kick you're referring to was the one I sampled from the game, so I'll try smoothing it out or re-recording it. Heh, not sure what to do about the ending. I thought the wind-down/fadeout sounded good but there's probably something more creative I can try.
Now if I can just figure it out before I get burnt-out working on this....