This week I've been doing a tutorial. I opted to only go into detail about the ui stuff, such as long pressing the spell buttons to show their descriptions, and let the players experiment with the spell mechanisms themselves. The sparkles I added to highlight buttons may need to be more visible? 

I reduced the long press delay from the default 1.1 seconds (way too long) to 0.7. 

I made a new spell called "Obliterate" that destroys a wall (or other obstacle). Functionally done, but needs some graphic work.

I changed campaign mode so that you start with the first nine spells. I think that makes it more fun from the start.