Reply to My first unmastered mix - would welcome any feedback

Hi - I've been starting to make productions (got Maschine and some soft synths, and working them all in my Cubase artists 6).

https://soundcloud.com/info-1410/sensation-the-ocean-of

It's for one of the beatport remix competitions and thought that'd be a fun way to start getting to grips with the software/synths and all the various stages for putting together a production.

I'm pretty happy with it so far, but haven't mastered it yet. Was hoping to get it professionally mastered but as the deadline is monday I've run out of time (and tbh fairly broke so haven't even got the spare cash for a single track), so am believeing of trying to do a very minimal mastering to it myself (know that's far from the best way to do this). Just hoped, could anyone give me any feedback as to what they believe, and whether I should be cutting any frequecies etc. I don't want to go for a hugely compressed mix, but do you believe I should add a little or a bit of limiter too ?

Any and all feedback VERY appreciated.

Jane