Really cool concept, somehow reminds me of the final boss stage of ToTK. A minor annoyance is it’s quite hard to tell which side the dragon is currently on. I have to jump through trees to find him. Maybe you can add a warning sign to indicate that.
Interesting. One thing makes me annoyed is the mouse pointer. At least allow players use enter (in addition to mouse) to the next level, or alternatively, give players the option to use only mouse to move.