I love tower defense games so this is right up my alley.
The game looks great and works faultlessly. It is hard but that fits with theme and if this was a normal game then I imagine it would start with smaller levels.
Love the look and feel. I saw an early version of this where you had the tiles moving up and down and was surprised you didn’t do this on the water to simulate waves.
Great game and I would certainly play it if was developed into a full game.