We're glad you liked it! If you're getting stuck in the blue trial area, try "left wall strats": Make your way through by only turning left when the opportunity presents itself, eventually you're bound to make your way through the whole thing and find the door your key goes to. The map might also come in handy to show where you haven't been yet.
I'm also fairly certain we encountered that bug during development and thought we'd fixed it. We'll take a look at it again! Thanks for your lovely comment and feedback, best of luck behind the blue door! :]