A very nicely put together game! It kept me engaged longer than I thought, and I got up to Town Hall 2. I died once, and it was fun to figure out how to play.
Art and music is fine, but I like your usage of SFX the most.
I played for about 10 minutes, but I felt like I got the gist. I would suggest some more fun surprises, but maybe I just missed them! (Some surprises sooner could be cool.)
Lastly, someone else mentioned island theming - I think it's fine enough, but extra points would be given for more island-themed monsters and structures. (But, I also liked the idea of it being a castle and an island town/village! So I'm torn on this!)
Very solid, well done.