I really love this game and I'm trying to do all the secret levels, but "slingshot" really escapes me. If the level wants me to do what I think it wants me to do (turning around corners really tightly in order to build up speed), then I don't think it's actually physically possible for me to do, since the timing window is so tight. I've thought about fiddling with some of the input settings to make things easier, but you can't do that from within a level for some reason, so that means I'll have to exit out and go through the whole ordeal of getting back to "slingshot". I really like the idea of the level, but I think extending the room you have to do the associated maneuver so you only have to perfectly get the turnaround once or twice instead what seems like a great number of times would make it less of a hassle to actually do. 

Yeah, once you adjust your input settings to have infinite buffer, it's so much easier. The new default settings are really bad for this level, I think.

i’ll look into that…the whole reason i made the buffer non-infinite by default is because some people were turning when they didn’t mean to, but maybe the default needs some adjustment

I beat this one and others that required a tight control of speed through frequent use of the Stop button. It's easier to maintain your speed that way. Also, you can hold a movement to automatically turn when you reach the wall.