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The door I was stuck on wasn't after a trap.  I'd say retrace your steps and look for anything you might have missed.  I did end up brute forcing a couple of the puzzles.

Finished it, well done! Tons of fun! One more suggestion -- the game should let you view the map you made after finishing. Thanks for a fun, innovative game!

Ah got it, yes that helped and got me unstuck!

Edit: I think if the key made a noise when you tried to use it on the door and it didn't work that would have helped a ton.  It would let me know it was the key not fitting, and not that I was unable to even try to use the key.

Super cool idea! This is the first game I've ever seen where you draw your own minimap.  I got stuck right at the start.  I have the golden key and I can see a locked door, but there's no way to use the key on the locked door and nowhere else to go and nothing to do that I can find.

Also it crashed after I left it minimized for a few minutes.