Any good tower defense games I do not have yet?

mc.

Do you have defense grid ?

Go Home Dinosaurs
Cubemen
Cubemen 2

did not check if u have

Maybe Earth Defense Force: Insect Armageddon?
I didn't see it in Your Steam library...

I thought ibomber defense and oil rush were pretty cool.

Aw you have too many games lol
Reversed-tower defense like Anomaly and Anomaly: Korea?

Or have Steam tell you :)
(Also, from the Flash version I had started to play a while back, Defender's Quest: Valley of the Forgotten was pretty neat. [edit] Just noticed it was mentioned already, so basically... +1. [/edit])

sanctum?

buy warcraft 3 tft or starcraft 2 and play td mods

Sanctum!

Plants vs Zombies - how did you manage to play it just 1.2 hours? My first session with that game alone took 5 hours :D

The best is Defense Grid. After that, it's Sol Survivor, then maybe Primal Defense (I haven't tried it) and Defender's Quest.

Anyone playing Tower Wars here? Seems interesting.

yep i got tower wars, quite fun
you have basic TD game + coop game + IA game + ranked games

the trick is that you are defending + attacking in the same time, quite hard to manage in the beggining but u can handle it quickly

Alien Hallway
Two Worlds II Castle Defense

These aren't EXACTLY tower defense games, but they share a lot of the same aspects and are really fun to play. Unfortunately they are both rather expensive for how short they are. They were much more worth it when they were included in bundles.

I know these are flash games but they were quite good and I played them for hours. The first 3 on the list, GemCraft, GemCraft Labyrinth, and GemCraft Chapter 0. Clicky

McDROID (still in greenlight phase, though)

Edit: there was a similar thread a while ago - clicky

Prime World: Defenders
Defenders of Ardania

Prime World is currently the one I am playing and has some great features.

Dungeon Defenders is the best!
I have a total of 3,098 hours of gameplay on it! (:

Well, you already have the best one, Orcs Must Die! 2 (DD is nowhere near that good), so I'd suggest you to play a little more of Plant vs Zombies, it's actually quite fun to build strategies for survival levels.

Tower Wars - The multiplayer is great if you have a friend to play against. Wouldn't recommend if you don't know anyone with the game because it will take you a while to find an actual match.
Orcs Must Die 2 - Also fun with a friend, but playable (and fun) in singleplayer as well. More combat oriented though.
Anomaly 2 - Have not tried the game my self but friends tell me its good. Looks like it too from the footage I've seen.
Toy Soldiers - A bit more casual, but still fun.

Warcraft3 custom multiplayer maps had the best tower defense games, starcraft/warcraft is pretty much where tower defense games originated from.

Warcraft 3 Tower defense mods <3

I'd give Fieldrunners another try. It's more of a conventional TD w/ upgradeable towers and mazing, which is lacking in a lot of the newer 'TD' games. I'm in the process of 100% it on PC, though I probably played more than 100 hours of it back when I had it on iPhone. Also, Plants vs Zombies is a great TD game, which may initially come off as really casual at first, but the difficulty ramps up and you can look into optimizing your layout in survival endless mode. It's anything but casual if you want to get past 100 flags LOL

I see you put in a lot of time on OMD2, and while I really enjoyed it, it doesn't really qualify as a TD game in my opinion. It focuses more on 3rd person combat, to the point where I went through most of the game not using any traps at all just to get bonus skulls. If you enjoy that mix of 3rd person combat and tower defense, you may want to look into Sang-Froid. It has a very deep strategy and planning element that I love, but if you want automatic defenses then it may not be your style. The majority of the traps in that game require you to activate them yourself, much different from most TD games where defenses are automatic. You can read my review here as well as an in-depth look at the gameplay mechanics here