Good start; a ways to go.
On the plus side, it's a neat (if often done) idea. Space theme movies are sadly underrepresented on Newgrounds.
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On the flip side, there's nothing terribly compelling about your story as of yet. Crew leaves space and finds nothing. It also suffers severely from lack of space sounds (yes, albiet the fact that sound doesn't travel in a vaccum - BG music would at least have been appreciated). And it's obviously unfinished.
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It's a neat idea - I would like to see the finished version. It just has some work to go.