The bass that kicks in at 0:17 could be more refined, to let the listener know that this is where it begins.
0:32 the lead is very catchy, but maybe a tad too loud compared to the rest?
0:51 I love the background leads/bass here, how they play so well and stereo out. Great job!
1:05 Nice transition, worth a good mention!
1:20 I'd wish for some more reverb on that lead here, but that might as well just be a personal preference.
1:40 The noise synth FX here is amazing, very creative and fitting! The disharmonies here at this part doesn't really appeal to me as much as in the other parts, but that's just me.
2:30 The part here could as well just be the start of a new song. You get it back well on track, though!
3:35 The main lead here and the cutoff play is absolutely marvelous. You should be proud of this part. :)
4:20 #BlazeItHurr, Back on track again, good transition.
5:15 same as with 0:32.
6:10 A fine outro, no remarks here.
Overall:
The lead is as said earlier a tad loud, but also tend to screech a bit, I'd maybe put some minor flanger/chorus/cutoff to it, to let it be less sharp for the ears.
Else you're very creative with the melodies and you work them well together.
Best of luck with the contest, we're in the same bracket! :D