I understand that the point of the game is to figure out the puzzle, but in that sense, I don't actually think the game concept is that fun. I wish you did more with the plot. I was able to extract the end card from the dev tools, and I do believe it would have been a more interesting premise to explore what happens after you found the blue library, within the game, rather than in an end card. I just think you put the most interesting part after a puzzle which does take an incredibly long amount of time to finish.
Also, I feel like the android export is unnecessary. The game is unplayable on android, not because it doesn't run, but because the text is way too small and the touch targets are also too small.