Place rooms, beds, mushroom farms, etc. Beds create minions, who automatically run around doing tasks like harvesting mushrooms. Rooms won't be free, so you'll be limited in the space you have to place things. They also need sleep when it's night time - so they'll run to their beds then.

Very much going to run out of time, but my todo list looks like great fun, so I may actually keep working on it after the compo.