Sounds like a nice reject for Hotline Miami. I honestly don't know how you can improve, other than making more songs like this and getting experience.

I like the nice 80's vibe to it, while still sounding modern by using sounds that you generally hear in modern house or trance music.

You also added a lot of effects that make it feel like its a tape, like the rewind and the fact that it has a quiet part at the end that is an earlier part of the song. (Sorry, but I can't remember the terminology :p)

Overall, a nice but repetitive song. Maybe if it repeated the same part a little less? I mean, its clear that you just copy+pasted because the individual parts of the song are really nice considering that you made it in 6 hours.

In case you couldn't tell, I don't know crap about music, and I'm just rambling on about my opinion. 4 stars out of 5.