Could have made a great horror movie ...
The premise of this movie is great, but they could have gone in so many other, better directions. The romance theme was too convenient to be believable, and the final subplot involving their fixing the ship was predictable.
Instead, they should've done a psychological horror, depicting the effects of solitude in outer space. Alternatively, they could have done a more standard horror centering on Jim's being a dangerous, creepy stalker. Think Dead Calm in outer space (or something similar).