Thanks, I'm now able to place them down!
The jigsaw puzzle matching for the turrets is a very interesting mechanic, and gives the game a distinct personality!
The balancing on the first waves should be a little more kind to the player imo, because it's easy to be out of money and lose a lot of health until you're able to buy a new turret.
Other than that, I think the game is pretty great, good job! :3