I build Banana Binge, StoneWarz, BurgerBinge, and RubberDuckz — four games that share one account, one chat, and one leaderboard, so your name follows you between them.
Most of it happens in the open on Twitch: features get written, bugs get found by chat, and suggestions turn into updates more often than not. When the code is closed, there is usually original music being made instead.