Needs to be much faster paced! Also the amount of cash deducted for some upgrades in the shop doesn't match the listed price - e.g. I just bought the 3000 point engine upgrade and it cost 8000, and I think the reverse was true for a weapon upgrade earlier...
That was cute :) It would have been more challenging if the whole cube was in play though. I think this would benefit from a random level generator, too...
Interesting concept - for some reason it reminds me of Fallout - but in desperate need of balancing, if you want people to play it more than once!
Overkill is completely broken - as soon as you get a decent weapon you can buy a few thousand hitpoints and then it's just shooting zombies in a barrel... I look forward to version two though :)
 "Gravity Thrower"){kind=icon}
 "Vulcan Siege"){kind=icon}
 "Red"){kind=icon}
 "3D Logic"){kind=icon}
 "The Endless Zombie Rampage"){kind=icon}