Modify or add art assets for your Storyquest's game objects (props). [tutorial]

Acceptance Criteria

• I modified or replaced at least one object in the scene (such as a background prop like a tree or house that is not part of the tilemap, or an interactive object like a target or projectile).
• I created art assets that fit the aesthetic of our StoryQuest.
• I pushed the changes to a branch.
• I submitted a pull request for review.

XP Summary (total 150)