I'm gonna put both of my replies into one so I don't have to write 2 comments lol
Yeah the water effect still didn't appear so I didn't know when I was actually powered up. I ended up just speedrunning towards doors and guessing.
I get that dashing through doors and corruption being cleaned is supposed to clue you in, but it didn't really click for me. Cleaning the corruption on the stage didn't make me think about the slide as an attack really. The door was closer I guess but I just saw it more as "cleaning up" than attacking. I think maybe something else that might help is if the corruption in the game was also red to match red gura?