Stardew Valley
Management simulation games are some of the best to play while at work. You can play for a few minutes, complete some tasks, and then close it to let it work by itself for when you return. Stardew Valley, a farming sim developed by one person and inspired by Harvest Moon, is certainly that kind of game.
After creating your character, the player is given a house and a plot of land in the titular valley. The area is initially overrun with weeds and trees with the aim being to reinvigorate the farm, increase revenue, and expand the facilities. It is addictive yet enjoyable in short plays and you can walk away from it at any time so it is perfect for wasting time at work. There is also a four player co-op mode planned for the times when it’s not just you who’s bored in the office.