An 'Overwhelmingly Positive' idle game about plastic ducks floating in a pool has a collectible card-game successor, and there's a demo you can play now

I am often in a state of delighted befuddlement at the games which prove popular on Steam, but few have simultaneously thrilled and baffled me as much as the success of Placid Plastic Duck Simulator. The game, which is really more of an interactive screensaver, involves guiding a rubber duck around a pool filled with other plastic ducks. There are 50 rubber ducks to find and a few other things to see if you can be bothered. But if you can't, that's OK too. As the game's own Steam description reads "live in the present moment, enjoy life".