Drawing pixel art to make it look good is hard because I didn't realize I wanted the player to not see what's beyond the camera limits.

Thankfully, Godot's Camera2D has a built-in feature to set the limits of where the camera should stop. The yellow border represents the limits of the camera view.

If I were to save time, I would create a tool with something like placing markers in the scene and you can select which marker represents which camera limit(Left, Right, Top, Bottom) instead of having to guess the limits.