So... apparently, the final boss' arms are still active after you deliver the final blow. Meaning if you aren't careful, you can still get killed by them when you start running away for the ending.

Also, WTF is up with the platforms on top of the Pillars for the Aquatic Ruin boss fight? I see runners use the spin dash to land hits, but every time I try I end up coming out of the dash at a stand still.

You need to move a bit to the left if you're doing spin dashes on top of the right pillar to avoid that, but that's not an issue if you land hits from the left one.

Good to know. So far I have been using the right pillar. I'll try left on my next run. Thanks!