Generally speaking, 99% of film, game, and especially TV composers don't have the luxury of composing for real players and they're under very tight deadlines.
Being able to produce a full piece, in sometimes a matter of hours, all by yourself, with virtual instruments is pretty much a mandatory skill. I don't personally know anyone in the business who can't.
Even I have had indie gigs that needed me to have a brand new tune conceived and finished in a couple days because they had a new level finished and they decided to include it at the last moment in the build of the game they're showing at some trade show or whatever at the end of the week. Not really enough time to get even one live musician on it, let alone a full ensemble, and definitely not when there is no budget to hire them and the gig doesn't pay nearly enough to justify paying them out of pocket and trying to deduct it on your taxes.
Yeah, well, if I round up all the time I've spent waiting on other people for things I've needed, even some of the most basic things, just with the stuff I can think up on top of my head, it would amount to 3 years of time being wasted waiting for other peoples' schedules, motivations, budgets and memories to get around to what they agreed to do for me. After a while, you're like, "Man, I am too old for this shit." and quit bothering.
Granted I'm rather on the south side of the bell curve when it comes to social skills and charisma that might suggest "fuck other people entirely" is not an objective wisdom tip when it comes to this stuff, but it's backed with a lot of experience that is definitely regretted.
I'm impressed by how well you spruced up an oft remixed tune. At first it sounds like a fairly conservative trance cover, but the longer I listened, the longer I felt willing to sit through the whole 48 minute video! Continued variation kept me listening, or maybe it was just the synthetic choirs (I'm a sucker for those). My only question is, how long is the loop?
Whether it's a trance or not, I quite like your beat for the classic and beloved Brinstar. The deep and insistent pulse creates the feeling of being encased by tons of earth while traversing endless alien labyrinths. It does get a little mushy, though, as it goes on. The timbre's are pretty nice, but something about them makes it feel like the song is slowly going through a blender. Which is cool, but I think that it needs a little work to be crisper. You've got a good basis for something very interesting here.