This game has 5 levels which are unlocked sequentially, followed by a boss battle.Kill all the aliens to clear the level.If even just one of them does, it’s game over. Don’t let the aliens land on the ground.Collect shield bubble power ups to protect yourself from the aliens.Collect asteroid power ups to replace the asteroids you lose.Take cover from the aliens using the asteroids in front of you.As much as possible, try to dodge alien enemy fire.Bottom row (touchscreen controls, left to right).Tap on the left and right arrows to move.Use the left and right arrows to move left and right.The game is immediately playable upon loading.Defend the planet from the invading aliens by shooting them down.
