This is a run and dodge concept that focuses on the foreground and background, but when you switch to those your player doesn't change size at all.
Thus in the foreground you're a dwarf trying to keep from getting stepped on, the middle is normal paced running, and the background is speeding along destroying towns and avoiding mountains.
I foresee a combo system, a time experience system (each "race" has a charging level bar), a dynamic enemy system, and a checkpoint so you don't always start at level 1. Why not throw in innate upgrades as well?
(BTW if you have to ask why I use dwarfs, it's because I also don't use gianzes

).