Games which you only control with mouse movements and no buttons are interesting to me. Firstly, it means the game will probably have you controlling it in a unique way. Secondly, it gives the whole game a feeling of floatiness, because you're never feeling the precise, tactile sensation of pressing a button and having instant feedback. This game capitalises on both of those things. It seems like you really understood the inherent floatiness part, because the aesthetics of the game were themed around that. It was just really relaxing to play, and I loved the sound the ball made whenever it hit a wall. At first it didn't seem like there would be much skill involved, but it turned out to be a bit deeper than I originally thought.