I found this trick while doing my low% run proof of concept (which is why I don't have dash at level 5 in the video below). You can use it to gain as much height as you want, using mosquitos:

If you use only one mosquito it doesn't work, as they bob down when you jump and you end up losing height. With three it's very easy, once you've got them clustered underneath you. I have no idea if this is useful in any of the current routes. You climb fairly slowly, but it might be handy somewhere.

That's insane. I had a hunch that you could jump on them but never got around to testing it. Useless for Any% runs since you have dash but with low% that's a fantastic trick.

Awesome indeed, well found. I wonder if there's something to do with it to bypass some stuff without having to use a wallclip. I've the floor 3 of the level 5 in mind obviously.

I talked about this a bit on my stream the other day -- I found this during my casual playthrough, and I haven't found a use for it since then. You go up so slowly that just doing the route without it has always been faster. Though, it might be useful for the no-switchgun run (if we can ever figure out how to get past the first room of level 2 without it).

Apparently you aren't the first to find this. It was done here at 6:15