Nice cute game!
The visuals are very nice and the overall look is very polished. I like how you kept a consistent theme for the entire game, with the text even fitting in.
I think that this game would benefit a lot from some more direct player feedback, things like small particle effects for when Boing bounces and then having a trail that maybe grows in length as your score increases. Basically, just fill it with a lot of fitting and satisfying things which is what makes simple games like this addicting. Maybe being able to build a combo if you consistently hit Boing in the middle of Bop, which can multiply your score and reward the player for being more precise.
The game gets very hard past a score of 50ish, since then you basically need to react to Boings direction immediately to make it there on time. I was only able to get 65 on Easy, and 52 on hard, in which both of my losses were failing to reach Boing in time.
There is little correlation with the theme, but I think it could be expanded more. Maybe Boing can do more things in the air to show that they are acting on their own.
Nice job!