Couple of things on my first run:
-Train scene wasnt particularly obvious with what you had to do the first time around. Spent a good minute or two jumping around thinking the train was supposed to go somewhere, eventually started mashing buttons on every wall until the door opened up. Might be a good idea to put a better visual cue outside of the train, but I'm probably just an idiot.
-I couldn't figure out how to kill myself, and had to restart. Ran into it, jumped on it, pressed every button on it, nothing worked and I had to quit the run. Hopefully I'll figure out what to do next run.
Everything else was listed in known issues. I liked the black hole scene a lot, you got the panic feeling down. If anything needs to stay exactly the same, its that.