I really love the game, but I disagree with some of the other commentors. I think the length is perfect. a fun, 3 hour play through is awesome. There are too many games out there that drag on forever. This is tight, enjoyable and super clean. I love it.
Good game, but it definitely needs a speed meter. It's nice to be able to see the progression of your runs and the impact that the items/enemies have on your speed.