Fun little game, with some more abilities both for the player and defenders I could see it being a good full game. I could use more information, like the reach of the defenders, their HP, and their strength. It doesn't have to be a stat screen, but the areas could show when you are placing the defenders, a health bar when you are playing so I can see how much damage they take every hit. Then with some experimentation I could sus out what the ranges and damages are.