Too much theme-riding
There's a little bit too much dependence on one phrase and one instrument-set. It doesn't come across so well.
The key for higher marks here is to up the number of sound types, how and when they appear, and especially -- use automation.
You can totally get away with dependence on one theme -- so long as the same theme never SOUNDS the same twice.
If you can morph, filter, and change-up the tune continually (which is a LOT of work!) there's no reason this can't have double the marks I gave it!