Sometimes, a tried-and-true game formula just works. Combine that with a shiny new control scheme and plenty of "Oh shit how am I going to make it through this!?" moments, and you have yourself a winner.
I had fun with this on my laptop until my hand started to hurt... which was about 6 mins in.
The game is tedious, I'll admit, but it is fun. And original for a turret game. But I think I need to stretch out my hand now...