To those of you having trouble with the speed shoes, there's a trick to them: You can press a little bit before landing and they'll activate every time. If you don't want them to activate, get in the habit of holding A right after you jump and keeping it held the whole time you're in the air. No press near landing == normal speed.
This is certainly a frustrating control scheme to internalize, but exploring it was the entire point of this project. :P
I'm getting reports that some browsers are adding a ton of input latency. There's not much I can do about that, and it'll make this game a loooot more finnicky to control. Try a different browser or the native player if you're getting lag. There is no input buffering; the game should be responding to your inputs basically instantly.