If you like tower defense games, this one is a solid offering.
Towers are upgradeable, and varied with what they do. I found it more of a benefit to use up all of your tower spaces before upgrading though.
Later levels even offer "open paths", where you can alter the route that the baddies take by your tower placements. Thats something not all TD games have.
Not much else to say about the game, but I do enjoy playing it.
