I hear the tune this way:
T: Transcription differences
%%score V1 | V2 | V3
V:V3 clef=bass middle=D''
[V:V1] z12 :||: z12 :| B8-B3B/2c/2 | B8-B3 B/2c/2 | B2 _A2 =A2 c2-c2 d_e | B12 |]
[V:V2] zAdc f_ab=a c'_e'a'^f':||:zAc_A _eB^fd e=ac'_a:| z12 | z12 | z12 | z12 |]
[V:V3] D12 :||: D12:| z12 | z12 | z12 | z12 |]
So the overall pitch content can be viewed as the octatonic collection (0235689e), or, in other terms, the D diminished scale: D Eb F F# G Ab A B C.
In the opening two measures, and also the measures with the melody, all pitches are present in the measure. The "alternating" measures (mm. 3-4, and whenever there's no melody) leave out the F.
The melodic shape of the three parts is interesting: the unmoving (pedal) bass D, the wide-ranging arpeggios, and the narrow-ranging melody.
I hear D as the pitch center.
I haven't found a pattern for the arpeggios, so best guess is they were just designed to sound cool, but without a specific motif or pitch-class subset in mind.