Really creative concept! I can tell this must have been quite complex to implement. I really enjoyed the audio, it sets a nice mood.
Personally, I had a bit of a hard time figuring out the mechanics from the tutorial (might be my fault for not reading it thoroughly, but I had to watch a video to understand what to do). I managed to complete 3 pages, but then I felt a bit lost regarding what to draw or how to set a goal for myself. Also, I wasn't entirely sure about the scoring mechanic and the hints on the pages.
Overall, this is a very ambitious project, and it's impressive to see this kind of puzzle/sandbox mechanic in a jam game. Well done!