Woaw, how did you manage to have that pixel-style graphics ! I would love to know how to make it. Gratz for your game it's quit good but a little too hard :)
render the game view on a low resolution render texture, then display this texture into the game scree by putting it into the main camera, I saw this technic in a GDC video by the creator of the game a short hike, you can look for the video in YouTube.
