A tower defense entry. That is pretty cool. It was quite easy, though. I beat the game on my first attempt just by building blue tangs as soon as I made enough money for it, and I think I only had the reef breached once in the early stages. Other than that, growing defences is an interesting application of the grow theme, and I liked the overall idea of protecting marine life by fighting against plastic trash. I think the game could be made a little harder, as it seems like nothing could beat the simple strategy of just building the most expensive tower once you make the money for it.