Cute game, I really liked the artwork and the universe. The gameplay fits well the theme, pushing you to "recruit" another balls to overpass certain zones of the level and making you to separate it to go through other ones.
Regarding the input, I found kinda difficult to realize how to jump (with the button's release) at the beginning, and personally I would wait to do it just when pressing it. Also, if finally the use of the mouse is not crutial during the game, maybe it would be an option to just remove it and use the spacebar to pass the dialogues.
Good job!