I saved the most time by pulling off the Quadruple Caste Boost: Getting enough speed from the jump boost from the bridge, which launches you and you can gain another jump boost. To be fair, still don't know exactly how to do it, but I think you need to time your power-up boost exactly right to pull it off. In the end, to me it seems that it's more dependent on luck rather than skill. I still made a few small mistakes so I'm convinced that beating this time is possible (in fact, someone has in fact done it), but you would need an absolutely perfect run for that, including doing the quadruple castle boost. Frankly, that's not something I want to spend my time to, so whoever beats this, can have the record lmao