honestly, i would end that game years ago if it werent for those "random" instances with the zombies falling from the ceiling..
Its like, if you run into one and there are only the slim zombies, youre good, but when you encounter a pack of those fat ones that need many hits to kill, youre toast...
the thing that i didnt see in other Tower Defense in that the Lava Tower when its on higher levels leaves craters on the road after hitting it with the fireball..