Sweet Bass... gotta say.

The kick/bass relationship is great. The kick flows quite nicely into the bass. It's really smooth and pretty much perfect for this song. Though I don't know if it will sound good, you could boost a narrow range of higher frequencies (as with a filter cutoff that has high resonance).

The drums are quite cool. The retro style fits the bass and lead quite well. I did notice, however, that there was some phasing with the high hats, so if you're using multiple, I would either pan them more, or adjust the pitch of both until the phasing is gone. If that's the desired effect, then maybe it would sound better if it were a little less pronounced (because it is a cool effect)

I really like the idea about the pad lead as well.
The one thing I gotta say about the it though is that the pitch lfo (or whatever is controlling the vibrato effect) is too strong. If you agree, then maybe you could control the amplitude or frequency (if you want to spend a lot of time adjusting it) of that lfo with another lfo.

Besides that, its a very cool song. You need to finish it!