Thank you very much for your long comment!
Level 2 was meant to teach the ships cannot pass a 1-teil gap between towers, but i had not enough time to write more dialogs. In fact i planned to write dialogs for all levels, but i underestimated the time it takes to write and implement this in multiple languages.
You should be able to win this pretty easy, when redirekting the ships with a "wall" of towers in the south with each 1-tile gap to the next.
So what's interesting is I actually had no idea you could build towers on the underwater sand until I went back and read this comment (and loaded up the game again). I think that might explain some of the difficulty I encountered trying to win. I was trying to win level 2 by only building towers on the 4x4 square in the middle... 😅 so I guess some of my feedback may not be as accurate.
But, with this new information, I might say that the tutorial should outline the sandbars when telling you where to build, or something like that. 😄
