Make sure to press COMMAND-SHIFT-R to make the game full screen.
Optional game: press any key to “reset” the trails left behind. If there aren’t any blue bricks left, you win. The faster you achieve this, the better, but you only get one try.
Code package: https://www.dropbox.com/s/m8qig1geusvsb8a/tyler_porten_depth_of_field.zip (fixed–it has both the source code and the mac app)