I'm really, really digging all the little sound design things you've done in Storm King - Definitely captured the alien feel you were going for.
The bass in Flamelurker is absolutely rattling my skull. It carries the melody very well, while also providing some intense low end. The texturing above it does feel a little bit drowned out by it, though. I can tell you had some fun with the stuttering!
Maiden Astraea is a really lovely electronic texture. I can picture it in a portal-esque game pretty easily!
Penetrator right off the bat feels like a bossfight. I mean, it is, but your rendition of it really feels like a bossfight. It's somber, and yet still intense. I really dig it.
Maiden in Black - Lots and lots of space in this one. Not to repeat what other folks have already said, but I'm definitely getting portal vibes.
Overall, I really love what you've done here. It all sounds really good!