I really loved watching those patterns emerge, move, explode, collide and evolve over time!

You can randomize or manually adjust the push/pull of everything and watch how the engine deal with it, creating new (un)stable patterns, I will spend hours on this just to watch. There's something peotic in my eyes about the simplicity of a physics engine running and I truly like it.

I rated 4 stars only because I felt those things were missing: being able to zoom/dezoom and/or move the camera around to follow patterns; a "buy max" option (which is very minor); and finally a way to adjust the quantity of particles after buying them to really see in what way quantity affect patterns & behaviors.

Overall great medidative experience, thanks to the dev!