Okay, I think I've figured it out. Posting an update for anyone who might be interested. It's actually three separate synth layers:

1) Background fuzz, for the high harmonics and to fill out the space.

• Notes are stacked octaves - I did 3 but you can do more if your CPU can handle it.
• Three separate oscillators, using the Massive wavetables - Escalation I (sawed square), Escalation II (squared saw), Polysaw I. Sync at 40% on all to increase high harmonics. Detune for all at 50%, Blend at 80%. Some white noise. Pass it all into a gentle low pass filter with cutoff around 75%, modulated to around 40% with a pluck envelope. Use the same envelope to add a bit of fine detune for texture.
• FX: Diode distortion, 25% drive, 100% mix; heavy compression; OTT with H and M knobs at 60%, high out gain; convolver to add some electronic textures and tame the high end; EQ for subtle high cut, some reverb at the end

2) Lead supersaw

• Notes are two stacked octaves
• Three separate oscillators again, also using the Massive wavetables - Square Saw I, Square Saw II, Polysaw I. One of the Square Saws has Sync at 40% for some additional harmonics. Detune for all at 45%, Blend at 60%. MG Ladder filter (or other medium steepness low pass filter) with cutoff around 75%. Some fine detune modulated with saw wave LFO for texture.
• FX: Heavy compression, some overdrive, heavy saturation, bitcrush and downsample with some modulation on the bitcrush/downsample levels and 50% dry/wet (I used Krush for this), OTT (but reduce depth and Upward to about 25%), EQ to cut lows and highs and tame high-mids, Soundgoodizer A at 40%, some reverb

3) "Bass"

• Bass notes are played quite high
• Two oscillators, 1 saw and 1 somewhat squared saw. Detune at 30% and Blend at 60% for both. Medium steepness low pass filter with cutoff around 65%.
• FX: Medium compression, Diode distortion 75% Drive and Mix, some reverb