Protect The Sandcastle

First off, I just wanted to mention the controls and features you might miss. You move left and right with A and D, and use space for shooting. In between waves you can build structures, just select them and press left click to place them, right click to cancel placement. Towers and walls can both be selected and upgraded, and all structures in the game can be repaired in between waves if damaged. Also, this isnt really obvious, but mermaids heal all other enemies as long as it is alive. And, thats about it for controls. This is the first time Ive joined a game jam (this is a subbmission for t...