The aliens leave the Planet to explore the Tunnels, but later discover that the Planet is no longer there. Some of them (led by the Angel) search for a path back, while others (led by the Runner) look for a path to the strange distortion in the distance.
Samorost2, the sequel to free browser based game Samorost1 is a short point-and-click adventure in which you must help out a little space gnome as he searches for his dog, which has been taken away by aliens.
Dead Frontier is a free-to-play, browser-based MMO game which takes place in a post-apocalyptic, zombie-infested setting. Players can explore a huge world alone or with friends, and wield over 100 weapons to be used on zombies or players in PvP mode.