i personally think it sounds fine. i like old skool bleeps, and i think it'd be cool to incorporate an arcade-shooter feel to this already shooter game. my preference would be have the bleeps fade out (instead of immediate cut) before their reintroduction), but thats just me being picky w/ trying to work w/ something so early in the works.
regardless, i'm deffinately digging the bit/symphonic fuse. the drums/base are fine, i wouldn't lower them, personally. very pretty song, sir.