On the Edge of Earth: 5000 is a sci-fi adventure game by Roope Tamminen, originally developed for the Ludum Dare 48 game jam under the theme of "Connected Worlds". In it, you play as an astronaut attempting to terraform a world, using a whole bunch of sciencey stuff he doesn't quite remember how to use. While enjoyment will on the player's tolerance for tinkering, On the Edge of Earth: 5000 is a charming experience that rewards experimentation.
Generation Ship is a sci-fi Unity adventure game developed by Shide for the Ludum Dare 30 "connected worlds" competition. Trapped in space with only a snarky AI, players must solve the cold equations and bring your crew to safety. While maybe a little heavy on the too snark, and maybe a little too light letting you know what things will kill you before they've done so, Generation Ship is a satisfying space puzzle to unravel.