Keys:
Arrow keys move the player in the game.
In the level editor you can move the screen with the arrow keys, TAB flips selected characters, DELETE deletes objects.
Most of the operations (selecting/adding objects/tiles) in the level editor are done with the mouse.
F1 - restarts the level
F2 - saves the level
F11 - previous level (editor only)
F12 - next level (editor only)