Wow...absolute genius! Well done guys! The intentional glitches are icing on the cake for this masterpiece. Matt should get a promotion.
BTW, has anyone besides me tried to go back into the beginning room with the first 3 zombies? They don't trigger their chase unless you go into the bottom right corner area, so you can push them around. You can also grab the gun from the "mauled" disco dolphin man and clear them out to exact revenge for your fallen comrades.
I also found that you are invincible, except in the one zombie horde room. So, have fun with that :)
Nice "game over" music, as well. A variation of Canon? All the music was nice, actually. I paused gameplay to simply enjoy the sounds at times.