You're Greg (if you don't change the default name), you're in a world that happens to be built out of 8 bit tiles since pixel art it much easier to make. Your mission is to wonder around a bit maybe mine some stuff and build some other stuff your choice. You could also try joining a multiplayer server such as play.te.dueutil.tech (port 5557) where you and other Gregs' can do not much at all (maybe build a Greggs for the Gregs'). I think this is a pretty good backstory.

Controls

Multiplayer

You can set up Tile Engine servers and play online (instructions included with download). If you don't want to do that you can join te.dueutil.tech port 5557.