I'm really jealous of the harpsichord/ guitar sound you have here... it all sounds quite good to me.

In the beginning at around the 1 minute mark, there are two leads which chop and change, playing the main melody, I would crossfade these to make the transitions smoother.

Theres also a long silence at 2:15 which seems to go on for two bars, I'd make it shorter, or go straight into your acid sound from the buildup.

Its a really good effort I think esp. as its not finished. Its a little rough, but I'll definately be looking foward to hearing it when its done.