I don't speedrun this game quite yet but I have found this glitch in Tassel Town that lets you go out of bounds using the Dryad form. The sandstorm will push you into the wall, and when you transform back to Shantae form you can walk into the wall. I've seen the normal Dryad OOB glitch but I felt this was different enough to warrant a post and see what you guys think.

I've only tested it on a couple areas to show that it works. I doubt it can help in a speedrun but maybe someone here with more experience can make use of it!