Amazing off-line multi-player game!
3 player co-op vs. the computer is plenty of fun. 4 player competitive is hectic, exciting, and full of action. The game has plenty of re-play value; I'm looking for more DLC. You would be hard pressed to find another game at $10 which offers this kind of value. The only knock is the graphics. Even on HD it is very difficult to tell what's what, and I find myself spending a lot of time breaking open the individual tower menu to figure out how many times I've upgraded it. The music is also generic and uninspired. A perfect 10 game would have upgraded graphics, sound, but maintain game play mechanics.
This game is as addicting, maybe even more so, than Pixel Junk Monster.