Marion’s review published on Letterboxd :
I guess someone read Across the Universe and figured they'd make the basic idea of it the plot for a movie. Good for you. I'm probably the only one to make the connection anyway.
The story doesn't say if they eventually ran out of food (sure the ship was meant to feed 5258 people over 4 months, but even 2 people living for 90 years must run out at some point, right? ... I'm bad at maths), or who died first and left the other one old and alone with nothing left to do but to fall into depression.