This is a really solid game. Never mind a game jam submission. Great work. Puzzles are fun and engaging and when I the elevator doors opened on the outside world I was genuinely taken aback. (I purposely avoid screenshots to stay away from spoilers).
There was a wee elevator button graphical glitch with flickering and falling gravity was a wee bit soft... The concept and delivery was really good though. I am impressed mate. Keep up the good work!