Drawing Types
When saving a drawing, you will see a drop down menu with the following options:

Tile
Tiles are used to create scenery such as the ground or props which can be walked on by the player character.
Object
Objects are used to create items or obstacles which can be interacted with by the player character.
Player Character
The player character is the main character in the game. You can choose from four different directions for the player character to face.
Player Up
The image to be used when the player is facing up.
Player Down
The image to be used when the player is facing down.
Player Left
The image to be used when the player is facing left.
Player Right
The image to be used when the player is facing right.