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One day if BTD 6 ever comes out I'd like game modes, such as a whole 50 - whatever rounds with your standard towers but on a water map, so you'll need to place a "raft" down before you can place towers on it, unless if you have a buccaneer. (the raft can hold only a certain amount of towers)
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A kind of annoying yet cool thing is that there are two paths for upgrades starting when you start upgrading and unlike kingdom rush not at the last upgrade and it gives the game a lot of different kinds of towers from just one root tower, another thing which is nice is you can put your towers anywhere on the map, well mostly.