This soundtrack captures the feel of the vast emptiness of space. It can be peaceful at moments, but mostly there is a dark ambiance which brings to the surface a feeling of foreboding, maybe because while space is wondrous and mysterious it also serves to remind us of how minuscule, unimportant and mortal we really are. I would use it for sci-fi games or thriller/suspense scenes.
Also, if you like this check out the soundtrack to the film Moon. While it is a different composer I feel they have similar themes and sound.