There is now a level selection screen (you can use maps made with the level editor from R12). The maps are now no longer incorrectly flipped (the placement of tiles was flipped from what it was before I started again from scratch). There are still sidewalk tiles specific for convex corners but the rest of the sidewalk tiles have been replaced with one generic sidewalk tile (There was too little of a difference between them and I noticed that even I ended up using the wrong sidewalk tiles a lot of the time). The health bar is back as is the energy bar. You can run again (hold shift). Zombies no longer die from a single hit and instead have a limited amount of health. Dead zombies leave behind a corpse rather then just disappearing. The size of zombies is now randomized to some extent. Their amount of starting health, the size of their sprite, the size of their corpse, and everything else about the zombies scales correctly to their size. I increased the zombie count to 1000 (four times the previous default) and also increased how much blood can be dropped.