I am very happy with this run. However, there is one thing that I can't understand. I put slide on the right mouse button this time, which is faster if you need a lot of tries and you only have to do the process once to stay in perma-sliding, unlike if you put slide on W and you have to do the whole thing twice. After the slide under the fire and after the jump down before the first wallboost you should actually still be in perma-slide and you should still have your air control. I´ve got always put out of perma sliding and get back into the geometry. In many levels, however, you need exactly that, for example with elevators, that you really stay in perma-sliding the whole time, which can otherwise change the whole run.