Fun idea! The art and the balloon controls were nice and felt polished. I liked the "voiced" sound effects :-)
The only issue I encountered is that I needed to sit on the floor for the balloon controls to be above me and to reach the cannon. I tried relaunching the game while being in different positions to hopefully trigger some automatic height logic or something, but it always put the controls super low. Anyway, not a serious problem, just a little annoying