A solid implementation of the classic Tents & Trees game!
I agree with Frédéric that it would be nice to have a difficulty select for different sized boards.
Not sure if it was intentional, but the music would just end while playing the game? It's nice to have the tune while solving the puzzle!
It could be a nice little addition to the game screen to have the boats move around, even if just a simple back and forth path.
Also, this seems unintentional, but pressing Option 1 on the title screen would display a grid, and pressing it while in the game would show the answer! 
