Loved the game! For some reason I didn't unlock the extra chapter by finishing the game... It's that right?
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I'm so glad you enjoyed it! And yes, the extra chapter *should* unlock when you finish the game. It unlocks when you play through to the end, watch the full credits, and then get back to the main menu. That should unlock the extra chapter and the full gallery - if that doesn't work then please let me know and I'll take a look to see what might be going wrong!