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Hmmm... that sounds strange. There is a green circle when you are allowed to place a tower. A tower costs 25 gold; you start with 25 and can earn 10 gold per ship you sink.  

That was on the list, but I did not have time to do it.

Way to hard for the first level. I need some turbo to get to all the houses :-)

Nice. Placement on the mob path should not be possible, and the "Place Tower" should be replaced by a icon of the mob. Great work!