Very nice trailer: http://www.kickstarter.com/projects/1757963851/planet-explorers

This is a sandbox RPG with nice features, and multiplayer options. It reminds me of Minecraft, but with a sci-fi theme and player-settlements! There is a demo playable on the website. I recommend watching the trailer has nice music, unique-looking monsters, and some cool sandbox content (mining/building/turrets)!