That screen panning looked too smooth to not have sub-pixel movement, but when I looked really closely I didn't see a single frame that broke from the 84x48 resolution. Props for keeping everything within the restrictions.
The presentation was very well don. The visuals looked pretty good by Nokia standards, and the movement of the zombies looked really smooth for something at such a small resolution.
The music was okay, but I expected a bit more from a game themed around dancing. I would've loved to see a rhythm element in this game, with the commands being in sync with the music. These types of memory games have never really been able to hold my interest for very long, but that would've kept this game from getting stale for way longer.
This game has some fun theming on top of the simple memory game at its core, and is good for a few minutes of entertainment. Great submission.