Alley Up (by Keith Sizemore)

App description:

A fun, never ending experience that brings challenge and excitement! Help Oop, the balloon, dodge a never ending stack of colorful 2D buildings and obstacles. Customize Oop with hundreds of combinations of skins and accessories. Test your skills in two game modes, "Endless" and "Time". "Endless" has a difficulty option for every skill level, even extreme with lava! Challenge yourself and your friends in "Time" mode where you race through either a set stack of building blocks or a random stack of building blocks. Pick up coins as you play to use in the character store, where you can purchase all new skins and accessories for Oop.