Ok, this is finally sub 1:30. But there's still a lot of time left on the table:

• Muspell in Firetop Mountain was particularly bad due to it splitting up twice instead of once

• I didn't get the cutscene skip in Sol City

• Both Carmilla fights were bad

• Neither Sabata, nor Hel 2 was good enough

So an optmized run of this route should achieve a 1:28 time.