He will follow your mouse, which is death. And in those days shall men seek death, and shall not find it; and shall desire to die, and death shall flee from them. The longer it is kept from him, the more desperate he becomes. Don't put the cursor off-screen that's cheating
You'll immediately lose when you first start it, I can't figure out how to change that. Just click the flag again. Also keep your cursor away from the center that's an instant lose.