At first, the tutorial levels had various books to read and each one had an image.
People thought this was too much, so I ended up having some images that should be simple enough to indicate something and then the books are used for text that should give a bit more detail about stuff like controls.
I also have an instructions thing in the pause menu.
Like I usually say, it's my first game and one I got too ambitious at but I managed to add enough that I think the game has a chance to be finished.