I've been building this for a while and the store page finally went live, so here's the actual pitch. You are the only competent employee of a grocery store. You stock the shelves, work the register, unload the truck, and chase the carts that customers abandon across the parking lot. Everything is physics-driven, so crates get thrown, carts get away from you, and the mess you leave in aisle 3 is still there ten minutes later when you finally have time to deal with it. The design bet is that the difficult...