That's true! Sometimes is better to hide than reveal your whereabouts. Haha, that chopper idea is fun, I'm not sure why I disabled bullets when you are in the chopper xD Maybe it's unfair to the zombies :P
I'm not sure what I think about rating. If development time is over 3 hours, the game could not win so maybe that's penalty for that. I really tried to make game under that time but I got too excited and couldn't stop :D Thanks for your feedback and playing my game :)