Thank you so much for playing and for all your feedback!
The bug with the sketchbook is something we were aware about during the development of the game, however it was something that we fixed before releasing it... or at least that's what we thought.
We're really sorry that you had to restart the game, some kind of save system is definitely something we've discussed since the launch of the game.
Thank you again for playing, we're happy that you could enjoy it either way!