Also, I found a glitch (that I haven't seen in any run, so it's probably new in 2.2): If you hold left/right, jump, and dash at the same time while standing on the ground, you get a huge horizontal boost faster and longer than a normal wave dash. The downsides I found are that it uses your mid-air jump and it's slower against wavedash chaining for long distances, especially downhill and bumpy surfaces.

I just learned about speedrunning for this game about a week ago, hello everyone!