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ok, reached wave 100 with just building machine guns and clicking "start round" (http://i.imgur.com/yUvlEXO.png). nothing else to do. and I've got enough cash saved to buy 160 more machine guns. this game may need some balancing ;)
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sandbags and machine guns are all you need. the machine guns (5K $) con't run out of ammo and have a good range. sand bags also seem to hold forever. you can add one or two of the big yellow things for fun. they are slow and shoot five rockets.
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survived until wave 10.
Then an endless herd of assassin zombie cyborg chain saw ducks sieged me, and the game crashed by lags after i ran out of ammo.
You can easily get to wave 10 making a fort of sandbags around yourself and spending all in ammo
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Maybe add a time limit, if you survive 2 minutes you get to the next level. Or you fail if zombies not dead within the time limit. Or let Zombies slowly chew down the barricades and get to you.
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I got to wave 3. There I barricaded myself so they couldn't get to me and I ran out of bullets, reloading didn't happen. The game still needs some work.