I couldn't get far enough to see the change in speed. I only made it to the third, or fourth area before losing to something.
Also, you can upload a post-jam version of your game, as long as it's clear that it's a post-jam version and not the original.
And I probably need to get used to that movement system, but it just doesn't feel right...
Anyway, I would love to see an update with bug fixes! As long as you clearly state that it's not from the jam, and the original is still up there.