Was going to give 5/5... but then I found out that on some of the upgrade missions, specifically ones that sandbag you into your own area without the option of destroying them yourself, can be impossible to finish. I have one zombie left to kill but it is too far away and not coming any closer... lame.
Game was awesome. only bug I encountered was that I was unable to pick new builds/workers up top because part of the menu was stuck. so refreshed. NO SAVE?!?!?!?!?!?!?!?!?!?!? why come save no work? 4/5. will change if save gets fixed and I come back to game.
game straight up broke. caught flying squirrell, then all buttons disapear. the arrows to go to different map areas and the button to switch characters and sound options. lame.