Idleplex starts you off playing sheep pong and when you earn enough money from that, you can buy other mini-games which you can level up enough to play themselves, and then you become a manager of sorts of the games. The game’s creator, John Cooney, attempts to explain:
I approached this game wanting to return to simple game mechanics. In fact, I considered how simple game mechanics could go, with simple shapes and single-button mechanics controlling everything. After defining these simple mechanics, I wanted to let the games play themselves, and let the players focus on cultivating a mosaic of these moving pieces.
I love these types of games. (via waxy)