I was left very confused after playing your game
The animation of the tower dying looked like an explosion and since the icon for placing them is a reticle, I thought I was supposed to shoot enemies, so I clicked on them, saw the little explosion animation, and was left confused when it did nothing to the enemy.
Once I figured out the reticle was just for show and I had to click away from enemies to place the towers, I was left with even more questions. Why did the towers randomly stop spinning and turn red? Did I do something wrong? Why did they sometimes break and sometimes kill enemies? What was the point of the ability button? It never did anything for me when I clicked it.
I think the game really needs a tutorial and maybe some more intuitive art for the UI and towers to avoid confusing players who already have no instructions on how to play.