Performance tips on grid base game

I am working on Pacman in 2D. For this I have used following image to create wall.


My game contains grid of 40 x 27 blocks means total 1080 blocks exist on game screen. I am putting those much blocks on game board because of this I am getting lots of performance lack in game. I am getting around 30 fps for game play scene. At present I have created only dummy level no other game feature and there is lots of fps loss for game.

I want some performance improvement tips here.

Consider using a single mesh and UV mapping your blocks into the mesh. Search for Voxels or Minecraft for more information on the concept. The following question has some starter code you can use. It is both more and less than what you need.