Your goal is the simplest possible one: get to the end of each level. How? By guiding blau - actually, an abstract black circle - through many simple - yet elegant - puzzles, avoiding physics-based traps and collecting shapes.
Once again: your goal is the simplest possible one: get to the end of each level; to every level, there are many solutions, which go from beautifully simple to deep and complex ones - it all starts with a gesture, then evolves with physics, but the end is up to you.