I was able to kill few persons with my knife, and even found a sword later ^^
I was thinking same with gameovertures thought: as it is there is not so much space theme in it.
It would have been cool if at least the game was introducing some story about where we are.
This way you could have use space theme, and it will even help for feeling more like role-playing if there was a reason for the player to be there and killing people.