The Walls are Not Cheese is a prototype created by Sparky for the recent Ludum Dare competition, where you are in control of a debris-shooting square that has to destroy the bluish shape located at the end of each level.

The small gauge located the the lower right corner of the screen indicates the amount of debris you have left in your arsenal, and you can replenish your stock by holding down the left shift button to suck in nearby debris. Watch out for enemy projectiles though, as their bullets can also be drawn towards you when the vacuum power is used.