Alien Invaders is on of the best shooting games we have available, when it comes to quality and how hard the game is. This game has 34 challenging levels that are getting harder and harder with increasing level. You have two lifes for each level which means you can get shot two times before you are running on your last life. There is no time limit and you can take however long you want. There is scores for each level and they will be added to your total score found in the high score menu in the home menu. On PC: move with the arrow keys and shoot with the space bar. On mobile, drag to move and tap to shoot.