Galactic Guardian: Defenders of the Planet

Game description:

In this game, you must strategically place and upgrade towers to defend your castle from waves of attacking monsters. As the waves progress, the monsters will become more difficult to defeat. You will need to use your resources wisely to upgrade your towers and create an effective defense strategy. If your castle is destroyed, you will lose the game.

Game controls:

Player 1:
Mouse Left Click Place defense towers