This is cool.
I'd be careful with some of the repetition though. In terms of composition, you like to stay with one theme just a bit too far out of its welcome before you move on to a break. When the theme starts off at the beginning it's really cool, but the constant trilling can become a bit of a bother after hearing it about 30+ times (I apologize for being a bit harsh, but it's probably no wheres near the detail that the judges will be getting in). I love the break at 01:17-01:50. Not only is it refreshing but the atmosphere you're making is well done. 02:25 reminds me of something that I learned at NGADM last year. Volume dynamics is a beautiful thing. You don't want a song that's loud all of the time because listeners ears will feel tired towards the end of the song, but at the same time you don't want a song that's too quiet otherwise it will give the listeners a feeling of emptiness during the song. So I guess a rule of thumb is more dynamic contrast the better. Last point about composition. Do more with the ending, especially since you still have time before the deadline. The ending is too abrupt. All you need is maybe an ending chord to properly end the song. Like whatever chord you're in at 03:58. What you're doing is that you have a chord that's in the main key of the song at 03:58 (I don't know what it is but let's say that this song is in the key of D) and then it sounds like you go into the 5th chord at 04:02 (lets say A) which acts as a transition chord. The problem is that you stop there. You're not settling the song when it ends and it acts as a really bad cliff hanger. All you need is a guitar and synth thing striking the main chord again with a drum hit and that's all you need to make the ending a bit better.
Now for instruments and mastering. As larrynachos pointed out the mastering is good. The drums are also good. If anything they could be just a little louder. But the drumming really compliments the song and I never once thought that the drums were out of place. The kick is quite authoritative and overall the drums drive the song well. The guitar work is really good too. Especially at 02:25; I really love that part. The most brilliant part of this song I think (aside from 02:25) is the synth in this song. It just blends well with the guitars, and (just like I've said before) the mastering is done just right especially with the synth.
So to wrap it up really quick. Not bad. You could explore themes move and add a bit more variation with sections like 02:25, but fix the ending. Especially since you have time right now. Fix the ending. It doesn't need much. Do it.
Good work and good luck
-Spadezer-