I can’t find any reason of rejection .
First and most of all, it should have a proper ending ! Or is this used for looping?
Anyway, I think the low frequencies are too much and I think mostly the mix of low end, and a bit the not well structured song is the problem. I mean, this track is so rushing to end… While some parts should last for 16 bars they last for 8 and so on… Its a cool track with potentials but not there yet. Try to finish the song properly structured . Hope this is helpful!
I can’t say why it was rejected, but at a guess, I would say because of the structure and repetition. They may have assumed this is just loops from a sample pack which is forbidden in their rules.
Thank u buddy