Cool concept ! Horever some levels can be annoying since how random based are each atoms. Would rated it 1 star because of that, but he has some educative side, so it's a 2 star.
I agree, the randomness of the atoms was something I hoped to squish by the end of the jam, but never got round to it. Giving the player control is important, especially in a puzzle game like this. A valuable lesson to learn for next time!