I like the creativeness of all the different curses and that the treasure chest could only be accessed with the super jump curse. It would be neat to have other curse-only areas if the jam was longer than a weekend. Like maybe something far away that can only be gotten to with the super speed.
As for things I thought could be improved, the jumping felt a little floaty, and sometimes I stuck to the wall when falling or jumping up.
Nice game, thanks for sharing!