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should we add a new tower? like a.. we should copy the soldier tower, and make plane tower and then vehicle tower, its now frontiers, so theirs another upgrade for bombers called "The Tank" and its voice is, look we got a god!. thxd i hope u like it :) even another new upgrade for sold towers, reincforcement so planes can bomb the enemys close to the hero station :)
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i would like to suggest to make some kind of survival where also the map increases in size over the duration of the survival, you start in a sandy place with a big river, the map expends so you start seeing more and more jungle and eventually pits and cliffs apear for the end game enemies to also come through, resulting en mega waves of terror after terror going through your dozens of towers, as for money i would give a steady cashflow instead of money/enemy so you can send in lots of weak ones without feeding the players, hope you like this idea ^^