I am too scared of horror games so forgive me for not going through everything. Very cool got spooked. Good idea to go for a horror game for the theme. Would have been nice to have to find the code on the level instead of having it in the UI. But overall it's a great basis.
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I agree, I originally planned to procedurally generate the maze and was trying to figure out how to make sure you could find the code within the currently open space. This was actually the problem that led me to decide on the nightmare theme. So it did not have to make sence in fiction how you got the code or why the code was math homework. I later gave up on map generation but might implement it post jam.
Thanks for the feedback.