Ah so it is a new update xD
Man I cant survive final wave. Is it because i dont expand as much as you do? I say i only expand like 3/4 of urs in that screenshot

The screenshot is from 1 day after the "line of sight" patch. It was completly new to us, that towers cant shoot over forests :(

The ballista on the right cant hit anything and the ballista I clicked on in the screenshot can only shoot if the zombies attack the upper wall part.

hey, i am still new. but i think the ballista behind the tree wont be able to shoot cos blocked by the forest. please check it out for me