Addictive
Well, after playing this game longer then I would have imagined I have come to the conclusion that it is nearly impossible to beat. Lvl 6, wave 78 and its game over. They mow through everything I throw at them. It has nice open ended gameplay in that you can choose the way in which you want the mobs to go, I ended up using a VERY long maze with a killzone of maxed out units in the middle. But I don't see a way to get enough cash to upgrade enough to stop those last 22 or so waves. Other then the nan bug which i learned to fully avoid now, it plays quite well. Just wish there was a variable difficulty for level 6, maybe a 1-3 diffuiculty with 10 being the hellspawns that are unleashed currently.
Advise to new players, is that its all about a race to make 1 BFG and 1 maxed out anti-aircraft gun. If you can do that without losing any health, you can pretty much relax for the next 20 or so waves and just work on upgrading more BFG's and stratigically placed zero frost guns.
If anyone has beat it, i'm very interested in how the hell its done.