With the hints I was able to finish it. Really nice one.
In case you want to continue working on this game, here are bugs I encountered:
Sometimes you respawn with gravity off (not sure what triggers it, but I think it is when you reset with the gravity off). You can grab the keycard out of the safe without opening it.
Suggestions:
Instead of saying locked, maybe say key card required or space suit, etc.
Add a reset button, because for some parts you need quite a lot of time.