(Very much a W.I.P & kudos to C3rb3rus for the Rafttrack)
You've crash landed on an Asteroid headed for Earth. There's no gravity (hold that spacebar+fwd key forever for some epic jumps).
You need to grab some phasers, jump into an escape raft/pod and make your way to the top of the spaceship for a victory dance.
Eventually I would love this to be a combo ride/quest to set timers on nukes that blow-up the asteroid before it destroys Earth!
Have fun and check back often for updates :)