I really really enjoyed this.
For polish it might be nice to have the atoms' momentum combine if two moving atoms collide, rather than picking one of the momentums at random, and maybe some sort of UI scaling so that the text is more readable on bigger screens.
Gameplay wise it could be cool to add some sort of budget for each experiment, that way you can try optimise to find the best solution.
Couldn't figure out level 10 due to the amount of stuff going on making it hard to concentrate on which of the atoms are needed for completing the final two goals, but I really liked the concept of a level where you are restricted to placing just the white atoms.
Overall I really loved this game, and wish that there were more levels to play :)