Eh...
Not bad, but I dunno why everyone is giving it 10's and saying "best game evar!"
I remember playing the other game that you seem to have mostly reused here (didn't even change the turret names... I'm fighting an army of killer robots with axe throwers and giant fungi?), and I feel the same about both of them - they've got that unpolished, random feel to them, and there's no immersion. I feel like I'm building a network of statistics and watching numbers compile, rather than fighting off a horde of evil machines.