I liked the text boxes. It was nice to read. I think the game should at least teach you how to do multiple jumps in a row to gain lots of height.
I don't feel like 40 tutorial levels is a good idea. It feels like the levels are way to the same. Instead I think like 10 would do it. When I make stuff I like to make each level have its own identity. So when the player enters it they can remember the level and with be a new experience.
Hope this helps to make this game great!