Interesting idea with alright execution. The combat could have been more intense if the player speed and the sword and bow were faster.
However, I think the story is far more compelling than the game and could be expanded into something bigger. Maybe the astronaut designed these robots to protect him, and they all calculate he's safer on his ship than on Earth, leaving the astronaut to decide whether to trust the science or his basic human instincts (or are they one and the same?). It's a simple sci-fi setup you could go really deep with.
Anyway, good job! Make more games :)