Super Mario Run should have given people 3 levels in different worlds, instead of just the first 3 levels of world 1. As soon as you hit world 2 things get a little more interesting, where those first 3 feel like you're just running left to right until the end. There's levels that scroll vertical and have you running side to side, or vertical ones where you loop from one side of the screed to the other. Multiple doors that could be the way to the rest of the level, floating platforms that Mario stops on so you can time your jumps. Nothing really new to Mario games, or probably runners in general, but more interesting than the basic design of those first 3 levels.