I really like this one. Glad to have the options for sound. I survived 6 waves. It was a bit chaotic, but that's good. I loved the powers. Forgot (if possible) how to use potions. And of course, chickens!
You can use potions by either clicking on their icons or using the NUMPAD 1/2/3. And yeah, it is pretty hard to get above wave 6 actually. I've playtested it couple times and the farthest I ever got was to wave 9.