The game has many issues running for me.  I get stuck on the menu.  The cannon gets stuck on the bottom.  The buttons probably shouldn't highlight when the mouse goes over them or appear clickable.  After wave #1 or dying, the game is frozen.  My main advice is to try to make sure you test the game out on the web, and on as many platforms as you can.

You got a game out, though.  With nice looking art style and good music and sound effects.