SHOP In this game, you can buy Turrets by clicking the arrow on the Top-Right corner. To exit the shop, click the arrow again. To buy a Turret, click one of the Turrets and a Turret and Range will be on your mouse. If you accidentally press the Turret and you don't want that Turret, move it to the Trash Can and click on it to delete the Turret. To place a Turret, click anywhere but the Track and already placed Turrets. TURRET The Turret will shoot itself but if you want to check the Range, click on the Turret, and if you want to exit the Range, click anywhere but the Turrets. ENEMIES Enemies will lose your lives if they reach the end so you must shoot them. You only have 20 lives and if you lose them all, it is Game Over. Also, the Enemies will become more powerful in every wave, the more waves, the harder it gets. There's a difficulty counter on the top side and it will show you how hard the game is. That's pretty much it, so enjoy the game.
This game was followed by a tutorial by @warfame and he is a really good coder. Warfame's Tower Defence Game: https://scratch.mit.edu/projects/411210603/