Choose the location of your fields wisely, then plant your seeds and wait for your plants to grow. Harvest the resources that are fully grown. Always make sure you will have the right resources at the right time in order to build solid defences.
Use the resources you have harvested to build, upgrade and heal your wacky defences. From automatic potato cannon to enemy-shredding barrier, use and place them wisely for maximum efficiency.
Once night falls, all hell breaks loose. Your farm animals are now possessed by the local alien species, they attack your defences, trying to get to your dome generator in order to disable your only protection against the emptiness of space.