Crowd Defense is a tower defense puzzle game. With a heavy machine gun and a cannon, you need to eliminate all incoming enemy units before they get close to your castle. Your weapon has limited ammo and reloading speed.
https://www.bestgames.com/games/Crowd-Defense/index.html
On PC and MobileHold and drag = aim with auto fire
https://www.bestgames.com/games/Crowd-Defense/index.html