Very cool sound here - it has an aura of mystery and intrigue to it that definitely fits a puzzle game. Your choice of instruments is spot on - it glues the soundtrack together as a whole hearing the guitar or bass sounds return, even as the synths are changing. My biggest critique here would be that for the last track, Out of Time, seems to be a bit of a disconnect from your description. For a timed puzzle that is the climax of the game, the mood doesn't click. It feels almost happy or accomplished; as if this song should be playing after the puzzle has been completed and victory has been achieved. It would have fit perfectly there and still felt like it really jived with the rest of the soundtrack. Overall though, the soundtrack was an enjoyable listen and solid effort!