Feedback: You've selected a great colour pallet - very bright and cheery as users would expect for a Christmas-themed game. The simple and easy-to-use UI, requires a very low cognitive load on users, resulting in a greater UX. The GUI is easy to read with its big buttons and standard layout.
Considerations: The look and feel of the overall scene and the character. Consistent layout and spacing across scenes. The user feedback from buttons and the character's functionality. Good effort!