Old untouched WIP from 2019, massively improved from the original, pre-TAStudio WIP from 2015. That one is just for reference.
Switches difficulty to Easy to make boss fights palatable because they last forever otherwise, as demonstrated in the older WIP. Uses grappling hook to save time at every opportunity (sadly, the game doesn't provide many of these).
I got stuck optimizing lag caused by the rollercoaster. The WIP is improvable elsewhere but still faster than anything publicly available by several seconds, last I checked.
Made on BizHawk 2.3 BSNES core but syncs on every newer version up through 2.9.1. I'll port it to v115 whenever I find the time and motivation to revisit it. Expect further improvements at that time, although I can't promise any big ones.