ECHO

 You're in a maze. It's completely dark.

  

  Press SPACE to emit a sonar pulse — it briefly illuminates the world.

  It also tells the enemies exactly where you are.

  

  WASD / Arrow Keys — move

  Space — sonar pulse 

  E — flash (find the yellow pickup first)

  

  Each level the maze grows larger and enemies get faster.

  How far can you go?