Apparently the developer LOVES cement. Would be nice if you could chose which of the options you wanted. I only upgrade sometimes in case there is something better than that. And why did I have to get rid of my cool cityscape poster? D:
Should be a way to just click the recipe if you've done it before, and auto craft it if you have the materials. That way you dont spend forever dragging materials.
When i have a zombie-controlled square surrounded by my squares on all sides, it shouldn't be possible for more zombies to spawn there (unless its the evil graveyard), but it currently happens.