The scale is a hexatonic, just intonation, non-octave tuning that has a few incidental octaves. As I recall, the tuning was a preset tuning pulled out of a synth, and was labelled as "hexany". That must be a mistake because hexanies usually repeat at the octave, but this one clearly has a non-octave repeating scale. Anyway, as a non-octave scale you can expect some cloudy tonality and that connects the bass, chords, and soaring melody in a vague way.
