Damnnn that was good! Loved the chiptune stuff and the sync lead. I would reccomend taking out the kick drum, portal doesn't have those, and adding more bitcrushed rhythms into it. I really don't know reason, so I can't help you there, however, having komplte 9 ult, I have found many many many of portal 2's sounds. Everywhere from I saw a deer today, the underground electric piano, to the turret redemption line. Personally I like to create my own patches cuz I feel using presets are kind of cheating (unless its a basic saw, square, sine, etc).
Anyways, I've done some stuff of my own, not nescisarily in the fast paced style you did (because I've never ha, but as a bit of a changed style for my mod and pac0masterand's abyss.
You can check out some abyss stuff here, and maybe some more when I get around to uploading more.
https://m.soundcloud.com/roy-berardo-official
You'll notice a significant addition of acoustic instruments. This is because the mod focuses on more of a human aperture, so I kept some of the "chiptunes" but added more "humanity" to it.
Also, a while ago, I did a <Holiday Name Here> map series. I threw together the soundtrack in about 1 hour.https://www.dropbox.com/sh/tsox741178yj ... 54Oqa?dl=0
Honestly, I really think the <Holiday Name Here> stuff is below mediocre.
That's all I could find that have been released. I have a bunch of really good stuff in progessprogess that u could post here when I'm back.
Also, bitcrushers are awesome.