Now I've tried the tutorial. I Think it's very good, easy and fast. I like the highlighting thing, but on the other side, as soon as I saw it I had to force myself to read the text before interacting at the highlight. I don't Know if that's good, doesn't matter or bad, but I guess it's up to the people themselves.
I Think to make people Think a little more about what they do, maybe adding a slight delay after you complete a lesson etc. could make people not just jump to the next task and perhaps forget the previous one.
In the basic tutorial, I Think creating an object should be covered too. Maybe it should also get people to see a galaxy, and then they were guided to create another one and watch them collide.
Maybe also adding a ring around an object?