pretty simple redstone wirring, but its okay

You should make the waves automatic so you dont have to flip switches. just press a button or it will run through the waves by it self

Does this mini-game also has a final score detection system? (If not if could be done flushing all the mobs away and kill all the zombies with iron golems, after which the remaining villagers can be counted, or shortly expose wooden doors through which the villagers may flee)
And do you think that you could improve the user interface, so no need to fly down to select the next wave and a button instead of a lever to start a wave. (maybe also add the enchantment infinity).
Won't the zombies burn to death when it is day? Because I could see the sky in your video, or did you place a roof much higher?

Very cool! Im playing on it with my friend, its very addicting! you need to get front page for this!!!