Hm, what are you referring to right now? From my understanding there's just something unclear about the definition of "sidescroller"... As I see it, the initial post was about a 2d game, but however, 3run's sample (not gravity, the new one) seems to be helpful, yes - in case that the topic creator referred to a mario styled game.
From my point of view, I guess there's no fault from 3run's side, maybe the topic creator should specify his request.