Agreed that we have G minor, however it is not Bb-Gm or even Gm-Eb but Cm-Gm that we hear
Strangely, when he is playing the bass line, he is using Ab and C as the two tones, but these do not fit against the chord progression (so I am left wondering if he has somehow used MIDI transposition to put it into his favourite key to play in (some keys work better than others for particular effects and technical tricks including smears (accacciaturas, appogiaturas, etc)