We figured out what the bug is! If you skip text after day 3, it crashes the game, because there's no puzzle set up for day 4. Thank sterkiherz for the context, but it's an easy fix if that's what happened to you. Is it possible that's what the problem was?
There are only 3 levels in the game, so you got to play everything. You can check this video if you're interested in how the story finished up (starting at around 20:04).