Interesting concept. I guess any "endless runner" would automatically meet the limitation.
I really liked the artwork! (except the gas tank, i thought it was a chicken leg at first until i read that it was gas
Artwork was amazing! audio was great, would be a great mobile game :) (i think having the character be a squirrel that runs on each side of the tree, would be more fitting) but its a game - i guess anything can go in a game!