Great looking game and I enjoyed it for a few hours but balance is a problem. As far as I see, Turtles are OP (or, rather, most other stuff is WAY under-powered) and you can beat every level with them clustered around the castle. The enemies are all very similar so you don't need to search for other tactics (apart from sticking penguins and fish slightly further out). Also, the upgrade/build more towers question is a total no-brainer here and upgrades basically select themselves. Haven't finished the game so not sure if this applies to the end but it makes the first few hours very repetitive. Sorry to be critical - really liked the game but balance is always the key to a great TD game.
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