Thanks so much guys! This is just what I was looking for, some concrete critique and not just my friends saying "oh, that sounds cool!". I'll definitely check out those tutorials and see what I can do about instrument choices and making the song more dynamic in general.
To be honest, I don't like any of the guitar presets in sytrus but I didn't know of any better ones. Does anyone know of a good guitar plugin (preferably free!) that may work well with this arrangement? If I can get my hands on some good recording gear, it might be easier/sound a lot better if I just recorded it with my guitar/effects processor.