It has the foundation...
... but it needs some work to truly become epic. You seriously have some great ideas going here, and I "partly" enjoyed the recycling tower ability, or at least at first I did. Another feature I liked in the beginning was the fast pace. However, once the levels got into the double digits, both of these features took a huge turn for the worse. Having to recycle my 2000 dollars or gold or whatever it was every level and moving my towers around become a huge chore, and eventually an impossible one. Having to upgrade my towers took time too, time that I didn't have. I think if you kept the "Send next wave button" in place until the player decided to press it, things would have worked out much better. I realize you get 10 seconds or so to setup, but that seriously isn't enough time before the waves of lighting fast worms come around. Then to have to panic and start the recycling process in order to save you picnic food is a real drag. Make a sequel with some improvements and I'm sure a lot of people would be happy.