This minigame, while suffering a bit from the creator's inexperience with game creation, proved challenging enough to keep me from quitting out of frustration.
The presentation is a bit simple, and the aisles could have used some variety; but having to complete the objective combined with keeping enemies at bay with your "butter knife" in the maze of shelving is fun, and only rarely was I swamped by zombies.
Post- Jam development should focus on:
disallowing cheating by climbing shelves with presents;
addressing issues with the mobs (i.e. pathfinding bugs and cheapshots between shelves);
polishing player experience (i.e. a better look for the mall, maybe adding a spooky/ holiday themed music, maybe small story elements);