Good idea, but gameplay felt a bit to slow. I also had no idea what to do with the coins? Also no idea if it was intentional but I could keep controlling the witch even after she died. I was controlling a floating hat basically. Also an automatic level restart would be nice or at least a shortcut to restart the level. Right now you need to go through the menu.
Also reminds me a bit of the Trine games, where each character has its own abilities.