I must speak but there is only bongos

Please turn your sound on :). Control using left and right (either arrow keys, A and D, the left and right bumpers of a 360 controller, or if on Android then tapping the left and right sides of the screen). Made in 48 hours for Ludum Dare 34.

You work on a construction site, helping put together buildings by ordering the crane around. One day, a wizard steals your voice, because wizards are assholes. Unfortunately, if you don't manage to finish the first nine floors of your current project today, you'll be fired!

Naturally, your only option is to communicate with the crane driver through the medium of bongos.

This game is my attempt to create something that fits in both themes - it is about growth (making a building bigger), and it uses only two buttons.