We should make oxygen and sunlight required to grow plants. This is more of a real life concept, but I was rewatching The Martian (great movie, lots to learn and implement) and when the home depressurized on Mars, all the plants died. Not saying we should make temperature a real factor, but we should try to make oxygen a thing too, since we have things to combat it, such as the oxygen sealer or bubble distributor. It would really add a real life effect on crops.