I hadn't read "Landing" before this--that's a beautiful comic, and a great one to make a game out of. :)
This game is very confusing though. The controls are not told and not obvious when playing. It took a minute before I had started the mission and started going. And I don't know exactly which way the comet is, so right now I'm traveling aimlessly with no real sense of purpose. The music is beautiful and well chosen, but I have no idea what I'm doing. I think I need to find the comet, based on the comic, but where it is is completely unknown to me. Not helping is the fact that as I travel deeper into space, the information on the bottom-left corner of the screen becomes unreadable in the darkness.
I want to like this one, but I don't really know where to go. Please make this clear, either in the game or in the description--it would really help.