Public release.
In a nuclear chamber, atoms of upgradeable size will spawn automatically or manually.
At any given moment, all atoms have a chance to disintegrate and give you energy which is converted in money.
You can improve many aspects of the game, like how fast they spawn, how much money is rewarded, or how likely they are to split.
If you progress far enough a new set of upgrades becomes available.
A game mode allows for chain reaction to happen.