Thanks, this is really useful feedback. We wanted to put in a save/continue system but ran out of time. However we have now patched in a simple level skip code - see description for details.
Because the Bronte skin dramatically changes the game, we didn't want it to be accessible to people who haven't finished the game already. The main secret of the game is not related to this skin so we don't mind if most players don't unlock it, its more of a fun extra.