Sanctum

If you like tower defense games, you're going to like this. I've beaten the first two maps and opened a few new weapons, and it gets more unique as you go along. I like the FPS element of this, I've played a lot of tower defense games and i don't think I've ever felt like I was in the middle of it. There are definite advantages to your actions as you personally gun down the mobs moving through the maze, your weapons are unique, you're not just a secondary observer as the towers do the majority of the work, you actually have to participate to keep the mobs from overwhelming the towers. So far there are only a handful of mobs, I'm curious to see what new stuff comes with the new maps. Assuming it continues to advance and introduce new mob types, we could have something very unique here.

Simple and fun tower defense game