Not terrible for 20hours especially that you had to draw everything yourself. Theme interpretation is good. I like the presentation enough. The drawings are good and music and dialog clips fit the vibe of the game. I missed some effect of popping the balloons (maybe some particle system) and some signs that the balloon is ready to pop.
The mechanics are simple but would be enough with some polish. There is no way to now when the balloon is good and the window is very small. This makes the game more frustrating than fun.
Anyway, congrats on finishing the game and submitting, it is allways a victory to do that :D. Please check out our game!