Quite a good game. I enjoyed it. I found some bugs: Sometimes the start battle screen doesn't become invisible, the lightning gun doesn't seem to fire no matter how many times i press fire, the level end screen doesn't always appear.
Quite a nice game. It has a few bugs such as spots where zombies fail to reach the platform they were trying to jump to, then getting stuck in that spot or simply getting stuck while moving next to a wall and barricade. The upgrade system is nice and simple, guns really get powerful when you use your precious tokens. The guard posts are kind of useless since one survivor loses his "title" quite fast if he's alone. Overall, I enjoyed the game and am looking forward to a sequel if you decide to make one.
The bowl is easy if you do this: Move your city as fast as you can at the top of the bowl. Put defenses on the right and left, than get bombers. Once the top part of it is safe, use the bottom for economy so you can strike back and win the level.
A weight system and a pressure sensor would be interesting. The sensor detects the pressure from the things above and sends electrons in everything near it when it reaches a certain pressure. Using the simple formula p=F/S (F=force, S=surface), meaning that the bigger the sensor, the smaller the pressure. So if you want to trigger a large sensor you need a lot more pressure than a small one.
Lightning would be interesting. Drop 1 pixel and it creates a nice lightning arc under it, burning everything on a close range, and stopping when it hits a block, transforming all the sand in it's way into glass, in the same form as the ark.
Strategy: Get the first gun and use it until you can unlock the door to the right, leading to the box. Try your luck with the box as soon as you can, since you can't get something too ineffective in the early rounds. If you get something good, use it's ammo cautiously, get as many points as you can, and use the box again when you're low on ammo. If you don't get something good, use it and get enough points to unlock the M4A1, which is good until wave 8 or so, and keep trying your luck at the cases.
Also, a good tactic to survive in survival mode is to get all the cops to a place with lots of small cars. Zombies get stuck behind the cars or at least slowed down and you can finish them off more easily.
The survival mode has a lot of potential. As does the simulator. There should be at least a winning screen when you kill all the zombies or get killed by them.
 "Super Battle City")
 "Zombinsanity")
 "Elemental War")
 "Insectonator")
 "Drop Dead 3")
 "Creeper World Training Sim")
 "One Chance")
 "Hambo")
 "The Sandbox")
 "SandTest")
 "Bloodbath Bill")
 "Class 3 Outbreak"){kind=logo}
 "Crazy Flasher 3")
 "Road of the Dead")
 "Days 2 Die")
we fix it. thanks.