CannonBall

Use mouse to aim at objects and shoot them down in time limit

Credits:

- https://unity3d.college/2017/06/30/unity3d-cannon-projectile-ballistics/

- https://gamedevbeginner.com/how-to-make-countdown-timer-in-unity-minutes-seconds...

- https://assetstore.unity.com/packages/audio/music/casual-game-bgm-5-135943