The "high pitch harmonics" comes from a bandpass filter with fairly high resonance where you sweep the cutoff.
Im not exactly sure of how the sound was built, but i would start by using saws for the high pitched part of the sound and then start adding lower pitched pulsewaves to get the "warmth" of the sound.
Then you run the bandpass on the pw's and use a lowpass on the saws.
If you want to make the sound more "spacey", insert a hall reverb and use the following settings as a starting point: decay 1500ms-2500ms, predelay 50-150ms and almost no early reflections.