Maybe there is also a cultural factor in our love to left->right.
Since we read from left to right, doing certain things (like playing a platformer) in the other direction seems a bit unnatural.

Maybe there is also a cultural factor in our love to left->right.
Since we read from left to right, doing (like playing a platformer) in the other direction seems a bit unnatural.

This, and the fact that historically the X axis is positive in the right direction, so from a programming viewpoint it's more natural to put more things to the right since you're adding stuff in larger coordinates. You're also progressing towards larger numbers when going from left to right.