I really like this adventure site. It's very unusual, and I always get excited by puzzles like this! I have to admit I had a bit of a hard time understanding the mechanism. Maybe starting with a solution state would help there. But I'm also not the best at wrapping my head around these kind of challenges. I'm sure a few more reads and I'd have it downpat.
Overall really cool and atmospheric. Do you think 3 hours is a good amount of time to solve the problem? That's something I never know how to judge.