Very interesting puzzle game! Addicting, with nice graphics and music, and very cerebral too.
The shooting mechanics work fine, shooting balls from circular pods spread around a stage to reach a goal is a concept that is simple enough to be learned quickly, and I like how intrincate the stages can get, requiring you to do all kinds of different tricks in order to reach the star (sometimes having to use a ball to push another, or to use a ball to control the position of a seesaw, or other things like that). So, both concept and stage design are pretty good.
I also like how there are pods that change the ball size according to the moment you click to release it, and how some pods will change a ball's color when needed, other pods that can be used only a limited amount of times, and all that cool stuff. That adds a lot to the variation in features, and of course, to the possibilities of the stage design.