A number of different enemy types are unlocked over the course of the game, keeping combat feeling fresh and challenging. (dualshockers.com)
You'll come across a few different enemy types and various obstacles yet all you ever do is run around and draw magnetic fields. (videochums.com)
The towers all look and feel different in how they work and they are easy to tell which are working effectively against different enemy types. (andymerrill.com)