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What would've made the game alot better is to have unlimited ammo but each bullet costs money. For example you don't have to buy ammo in between rounds but every time you shoot you lose a certain amount of money.
Cot 4 is probably the hardest for me, CoT 5 was easiest but you had to use your mind. Only use 1 meele unit. You have to use the water mermaids though. Makes the other 3 whatever you want and i would strongly recommend to not use any of the units you unlokced during the cave trials.
One more thing do not send any soldiers until your mana is 9000 + or less they could possibly send their huge army. This strategy worked for me from levels 1-15.
I will give a hint to beating all levels without bosses. If your stuck on a level upgrade everything possible then keep on upgrading your mana until it is high, 9000 +. Then just spam your strongest soldiers. IE: Make like 25 paladins.