Everwarder

In Everwarder there's you, and a procedurally-generated world covered in darkness. Touch it - and it will spawn a creature that will try to destroy your most precious thing – a crystal with your friend trapped inside. Every run starts with your crystal and a supply of energy. Then it's up to you how to fight the darkness. Do you steadily expand, clearing the darkness, harvesting its energy, and carefully deploying defenders to deal with whatever emerges from the dark? Or do you play it fast and loose, striking out to locate ancient structures and powerful artifacts hidden within?