i know where you got these ideas from
i know for fact you mustve got the idea for this from any 3 of these games
CoD WaW - the barracade fix and Zombies.
CS - SAS
CoD4 - SAS
or basically any game with those ideas
BUT damn you made an AWESOME game!!!
only problem i hated was sometimes keys dont work when you somehow get stuck in liek an invisible wall till u press up down left right repeatedly til u can move again