Bubbles grow in a small universe and you click them to collect the cash. Spawn more, collect faster, and spend on auto spawn, an auto collector, a wider attraction radius and merge bonuses until the bubbles are collecting themselves. The physics are real enough that bubbles drift and merge on their own, which is the best thing about it.
The author labels it an alpha and says there is not much to do yet, which is accurate. Prestige exists and costs twenty thousand, achievements go up to a thousand bubbles collected, and that is the whole of it. Safari crashes on it, so use anything else.