This is definitely one of the best Tower Defense games I've ever played. It has all the standard stuff you'd expect from a great TD title --great tower/trap selections, plenty of variability in enemy units, a build-your-own-maze approach, and solid graphics-- but then takes the genre to the next level by being played in three dimensions. Sure, some maps are your typical flat plane, but more often than not you'll be spinning & twirling around interesting, complex 3D surfaces that totally upend those strategies that universally work in every other TD game. Definitely worth a look.