I disagree with that notion, it distinguishes your design and still echoes the submarine/future castle of Ron Cobb's work and Ridley Scott's ideas.
I'm glad you got the submarine vibe. I have a thing for production design/art direction of submarine interiors - so claustrophobic, and every surface so densely encrusted with textural detail, it really makes a set come alive.
I enjoyed that. Seems like the zero-G stunt would have been reasonably ambitious but something I would have liked to have seen.
(Like i said earlier, this is all thought experiment, but) I think I would try lifting the actor's feet with wires and angling the camera appropriately, then painting the wires out in post. For the crane I would remove the static prop (made of foam-core/cardboard/PVC-pipe) from the set and replace it with a CG duplicate that could be animated. The alien, ahem... CG?
And of course, there is a practical reason in the story for having the lights go out.