Great simple game.
But it could be a bit more challenging

please make a button to DOUBLE the actual double speed and a mute button would be also cool

Very easy.

los zombies podrian recoger herramientas y no siempre tenerlas a la mano, esto aumentaria la dificultad, ademas de que podrias hacer que estos se meuvan mas rapido!! pero en fin es un gran juego y ponle otras canciones de mas jaja

was fun until i hit lvl 17 where my zombies couldn't pick up the silver keys. i can understand why its slow, nearing the end it would be to fast for u to do stuff with it going fast considering some stuff u cant do until the game is actually playing, was great fun, had the right amount of lvls to keep me interested. just the but at lvl 17 stopped me playing lol. nice artwork keep it up :) also when adding something in, think weather it might become annoying for longer use, the fall down animation was abit annoying i will admit ^^;