Interesting first concept. It has the beginnings of a full minigame if a bit more time is invested! Does aligning the asymmetric center of each ball matter? Or is it just overlapping the balls? Does the red ball have to be perfectly inside the purple one? It would be really cool to implement something where as time passes, the purple ball gets faster and faster, so it's more difficult. I also like the sort of randomness the game has inherently in the design. It would be awesome if it had a time limit and gave a score at the end.