I would also recommend to lower difficulty by making the elves slower/stay on ground for longer/purposely worsening their search algorithm & make the snowballs unable to move the ice cubes, possibly make the ice cube movement faster..
And add an arrow pointin' to where the Christmas gifts are, with varying difficulties, at Easy it'll show you always, at Medium once you found all, at Hard never..
The escape button seems to be not working in the final level as well..
^w^