Watched that last night. Really amazing. Emotionally brutal. I recommend watching it in blu-ray because the Danish bucolic settings are beautiful.
Regis, you need to see the underrated Silent Running. John Carpenter's first movie Dark Star is worth a watch. I assume you've seen 2001: A Space Odyssey and maybe the crummy sequel 2010.
If you're after bleak sci-fi you've kinda mined most of the space ones. There's other that aren't set in space itself like Gattaca, Logan's Run, Soylent Green, Children of Men, etc.