You managed to give your VN a more interactive feel than most, I really enjoyed that. Wandering around Visitor Station and unravelling the mystery was very captivating. Got a bit confused by some of the flashbacks, but that may have been the whole point. The ending seemed a bit rushed and didn't sit well with me. I felt like the actions should have had a bigger impact on the protagonists. But maybe we just don't know the whole story and it makes more sense than it lets on.
Navigation was fine. It took me a moment to find my way around the map, but I like it. The graphics (and colours) add a lot to the atmosphere. The story is also well written. Very intriguing.
This is a great, short VN. :)