Myabe it was just me but the gun did not do a good job following my mouse. I was never shooting where I wanted. I found myself playing this game out of frustration more than enjoyment.
Buggy... after getting to level 20 somthing I tried to upgrade a tower. suddenly all of my towers disappeared completely and the baddies invaded no problem.
 "Diamond Hollow"){kind=icon}
 "Home Sheep Home"){kind=icon}
 "Danm creeps survival"){kind=icon}