Thanks! I will redo how levels start (player will need to enter a door) and it will let to replay levels as well. Demo has no save system on a purpose, of course full release will have it. "are we going to find out he somehow managed to destroy an entire castle?" - very close to it. "Completing a level (barrel level) unintentionally is a thing" - yes, that's part of the puzzle, some levels can be done in a "short" way when many items are still not "fixed".