Very interesting. Lot of contents and features. Except for the audio missing some background music and figuring out how the start button works I find the execution was very well done. I love the retro style pixelized aesthetic and like the punctual sounds. The book thing is really funny. I thought you couldn't erase at first so I optimized the space hahaha.
A bit subjective comment (And a bit picky :D ) so I won't hold it against you. I am not to sure about the movement system would have preferred to just move around but I guess it's probably a reference to old school image based games. It works great though. Camera transitions are so smooth and nothing wrong in the feature itself.
Other than that puzzles are well designed at least for the first room. It's super intuitive to play. I really like the visual of the second room. Escape game enthusiast would love it. Thematic works well. Could be a very interesting game if you decide to continue. Nicely done!