Well, in all honesty, I'm very impressed! This level is actually excellent. A lot of things about this level simply work, and I think it would be a worthwhile addition to the mission. Of course not counting the robot population - you're horrible at that and I'm sure you haven't tested your own level on Insane. Hell, I couldn't beat this on Hotshot probably
As for the texturing, the ice version looks pretty much impeccable, save for animated textures, of which you've only replaced the first frame, so all doorlights and monitors need to be fixed. Use the template next time, or go frame by frame in dle-xp. For doorlights, just replace all the frames with the static D1 texture.
I like the texturing in the ice version better than the Puuma Sphere version. It's very creative, varied and beautiful. However, an entirely ice-based level simply doesn't feel right for the Alien 2 boss. It would need at least some alien accents here and there (more than it does have, at least). I'm not sure if this wouldn't ruin the texture cohesion, though, which I'd say is pretty amazing. The alien version of the level does look good on its own, but it's also a bit bland and generic, looks a tad hastily made compared to the ice version. It does work though, and is not such a bad place for the D1 L7 boss. In both cases though, it does need more secrets with goodies in the arena room, and needs more triggers for the matcens there, but each of them should be one-shot. Being flooded by robots of this strength in a boss arena is too much for anyone to handle.
I really like the swirling texture corridor, but it doesn't amount to anything, which is sad. A corridor looking this awesome should lead to something secret and amazing, perhaps even a secret level teleporter. Right now it's just there to tease us. Again, the texture alignment here is seamless just like with those rivers in Dacol Futyl, this is pretty impressive.
So yeah, here are the options I'm considering right now:
1) Include the Puuma version after suggested changes and improving texture variety
2) Include the Ice version after suggested changes and adding more Puuma touches
3) Include the Ice version after suggested changes, with no theme change but after turning it into a reactor level (my preferred option)
Before deciding, I'll let others chime in too, though.