Wow! so simple and addicting. I was enamored with my turrets holding the line on their own after I holding the line myself for several days. It started as a crazy difficult aimlabs minigame, then turned into an auto-playing cookie clicker after I made enough money for a strong enough line of defense. I see how the beginning days' difficulty could be a problem but I got to night 8 on my first try. I was definitely clicking as fast as I could on days 1-4 and even then, many zombies made it through, but the rest of the days were a breeze with the turrets. I found the turrets lighting up the ground rapidly and zombies dying quickly to be satisfying, but with a little more juice like bullet tracers, and maybe particles, it would be even more visually satisfying.