Play any type of Game at Y8.com. The biggest Game Collection to play free online. Flash, Unity 3D, Html5, Android, Java and Shockwave.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Tower defense like game with unique gameplay (i hope).
Build towers, protect you base, everything is like on regular TD like games. But you should use your boat to build.
Use arrow keys to move.
Space bar to build towers.