I have tweaked the dash, increased the size of the tooltip text and fixed the bug that was preventing a double jump when walking off a ledge.
Regarding what we'll keep, the only thing we're not sure we'll keep are the double-sided platforms, because of how buggy they are. I've been thinking of other ideas to implement that (or even something similar but different) that may be less bug-prone.
We have also considered implementing Coyote Time, like was suggested in one of the feedback documents, but it is not a priority for now.