Wow cool, I really like the music.
Orxonox music and main theme are very nice. There are maybe a little too much drums in the beginning of Orxonox music, but otherwise both samples really capture the spirit of open space. nice
The other two samples are not _that_ epic, but I like them as background music to increase the thrill. Maybe it's possible to make them loop seamlessly? But I'm not sure if this is possible.
By the way, "staying alive" doesn't sound to me like "tight action", more like "sneak around and search the enemy". For "tight action" I would rather suggest something like the fast parts of "fog and flashlights" - that rocks
