Final Fortress

You control a stationary turret at the bottom of the screen, using your mouse to aim and left-click to fire at waves of enemies descending from the top. Your main goal is to protect your base at the bottom from these invaders. Between rounds, you spend the cash you earn on new units, like additional turrets or barriers, to bolster your defenses. The pace is steady, with each wave introducing tougher enemies that require careful placement and upgrades. It feels like a constant, methodical scramble to build just enough firepower before the next assault begins.