Very good map completed it by round 19, like the idea of surviving 3 more rounds but you should of made it so them 3 rounds are a lot harder than the normal rounds such as: more monkeys spawn, faster zombies and stronger zombies
Treyarch should hire people like mr piemam, redspace2000, offthewall, hexzombies and other great custom zombie makers and they should work with treyarch zombie makers to design and build zombies in future call of dutys produced by treyarch