title: Make pixel lighting like terraria and starbound
body: <p>I'm making a 2D sandbox game like "Terraria" and "Starbound". This is my game</p>
  
  <p><img src="https://i.stack.imgur.com/5SSku.png" alt="game"></p>
  
  <p>The light is filling the whole terrain but i don't want it. I want following: </p>
  
  <p><img src="https://i.stack.imgur.com/MBz8M.png" alt="desired lighting."></p>