Model adjustments and more!

Hello! Had to take a break for my own sanity but I'm back with an update!

Patch Notes:

• Adjusted Model and Sprite for the first major boss.
• Added a new attack and made adjustments to the flow of combat for the first boss fight.
• Decreased the chance of Brittle being applied by the second bosses Ice attack.
• New areas to explore.
• Further story so that the demo now ends on a more impactful and natural place.
• A new optional boss.