Great game but it needs an option to change the graphics quality. Trying to play the challenge mode on level 3 was impossible due to the amount of zombies on the screen.
Brilliant soundtrack, brilliant story-telling and brilliant art design, 5/5 from me (and don't get me started on the quad-boobed alien-human lesbian romance ;p).
Seriously, the fact you cannot keep more than one squad in cover needs fixing. so many times have my machine gun teams ran out into enemy fire because they apparently can't stand too close to other soldiers.
On wave 5 of wildwood, i tabbed out for a second and when I tabbed back in, the "click here to regain focus screen" was still up but the game was playing in the background.
You should improve the end of battle statistics screen, adding in the total number of casualties taken on both sides and the total number of casualties taken for each squad would make things much better :p
Maybe instead of adding different priorities into the targeting system, you could just make the mortars range an awful lot bigger (it makes sense realistically, a mortar has a huge range compared to an SMG or an AT weapon).
It's an alright TD game but the interface is stupid. There was so many times that I couldn't select a tower spot to build on or an actual tower because it was behind another tower or a monster or even behind the UI itself. The overall game would've been so much better but it was these aspects that just made the game make me angry.
Also, the first wave shouldn't start right away when you start a new level, I actually want some time to have a look at the map before being rushed by swarms of monsters and then restarting the level so I can actually use my plan.
 "String Theory")
 "Dead End St.")
 "Midas' Gold Plus")
 "'Til Cows Tear Us Apart")
 "Warfare 1944")
 "pulse")
 "Sentry Knight")
 "Rainbow Shooter")
 "Barons Gate 2")
 "Relic Of War")
 "Hordes and Lords")
 "Back to Zombieland")
 "Sky Quest")
 "Command & Control")
 "oO")
 "Demonrift TD")