(Might be a Spoiler ahead :P)On cave 5, use Athena's protection, the invinsible goblin won't get through, and you'll have time to destroy the castle. Try Hercules strength also to speed up the process.
Every time I put that Beta Poster or maybe any furniture in my float, I can't save it, go back to the furniture menu, or click on anything unless I cancel or delete it.
This game is really fun but it kinda bummed me out when the last rifle (Remmington M24 SWS) is jacked. The shot is not reacting with the pixels therefore, it doesn't do anything :P at least the others work.