I tried it again and I could tell you more.
What happens is the key bindings show up as blank at the game start text.
Pressing Z, or any other key, doesn't work when standing near the first lab door, or any door.
Pressing X shows the list of key bindings, which show blank just like it does for me at the very beginning of the game.
I could provide a screenshot in case if you like of the game text showing blank key bindings.
It's very bizarre, I never saw such a strange issue in any game in this jam, and from the looks of it the issue might only be affecting me for this specific game only.
Since maybe it's not affecting other people playing this game, I might continue to skip giving any rating for now unless I could somehow get it to work.
Not sure what might be the issue, what do you think might be wrong?