Looks like someone made a model of the first few rooms of Tourian in a modeling program and then did a flythrough. There's no evidence of any actual gameplay. I could probably throw something similar together in a few hours.
I hadn't seen that, and that does make a significant difference; a decent Samus model is a big step forward. Still a long way to go, of course, but I wish him luck.
My own project is sitting at 6383 lines of Python and many months of work, and I'm only just now getting around to adding enemies...