Hat tip to Grace for this post as I haven't thought any connection of the game's icon to Pokemon Go after she mentioned its inspiration to Pickachu. Tiny Tower changed their icon together with an update released last week. As I was browsing on Nimblebit's Twitter account, I also saw this post on their page. Lucky for that guy as I still haven't unlocked the Bickachu costume, haha.
You can download Tiny Tower free from the AppStore. Go download the app now and build your own Tiny Tower.