Clint Mansell's original soundtrack is absolutely fantastic. I read they managed to get him involved in the film because it was during the writers strike 07-08 (remember that?!) and Hollywood had ground to a halt, hence Mansell and ilk were looking for projects to keep them active.

I like your song, but it's a different vibe. To my ear, it sounds a bit too military to be Moon. I do like the vintage synth sounds though!