I paid $400 for my samples and DAW, why should I give my music away for so cheap?
I realize that good samples can be pricey. Unfortunately, you are competing with composers who have spent thousands on their rigs: Computers, $2-4k worth of sample libraries, breath controllers, etc. Or even composers who, for their demo reels, paid the $ to hire an orchestra or have some live instruments to play on their demos.
You are correct in that your compositions are good. But many (most?) game developers won't hear past the mediocre production values due to your sample libraries. That may not be 'right' but that's pretty much the way it is. So you may lose out to a 'worse' composer, but who has better production (samples).
One thing you might want to look at that's relatively inexpensive is to try out "Composer's Cloud" by east west. You can pay by the month, and there is a 30 day free trial.
Get a couple pieces in really good shape with your existing samples, and then signup for the trial version. Youll have to spend some time learning the library (learning how to use a sample library can be like learning an instrument--it takes some practice to make it sound good). At the end of the 30 days, you'll have a couple of really good demos. And you know that when you get a gig, you can always pay $30 ($15 if you're a student) and have all those sounds again for only as long as you need them.
(Note: I am not affiliated with East West in any way)
Good luck! I challenge you to re-post the music you posted above, but re-recorded with EW composer cloud samples!