A lovely OST. The last track (which is more of an ambient track) is very pretty.
The rhythm section of "Time is running out" is particularly powerful. And I love the subtlety of the ticking clock.
If I may be permitted a constructive criticism, the high-pitched sounds (flute, violins) seem to me a little loud and a little too prominent at times. Nothing crazy, but as you've done an excellent job, I'll allow myself to nitpick.