Really great concept. I love the stranded aspect; it reminds me of the movie Moon, one of my favorite sci-fis. It's a bold look into the human soul, and you tapped into it here really well.
If I may offer some critique: I think the writing could use a little tightening up. I got the ideas expressed, but the text ran on in some places. Other times, I felt the story needed a little more impact. Neither took away from what you were doing, though. But I would like to play a game like this with a stronger narrative, personally speaking.
I think your design choices were solid though (good on making the clickable areas "finished" and unclickable after finding them). And the soundtrack is fucking amazing. Overall this was a brief, wholly enjoyable experience. Now take this idea and run to the end with it. :)