Interdimensional Postal Service

Consider the following: have you ever had an experience get you goin' more than a high caliber, robust postal service? Imagine you were afforded the opportunity of employment at an establishment as such. Would this not be the highest honor? Meppy seems to think so. Join him on his excursions though time and space, as a genuine interdimensional mailman, to keep the postal service alive!

Arrow Keys, Z and X (or optionally WASD, J and K)