Alien Force places you in control of a space ship on a mission to destroy all enemy ships. Destroy every ship on a level and you go up to the next level with more difficult enemies. The action is showed from top-down, and you move around on a one-screen field with obstacles. You are only allowed to shoot one missile at a time, so the game is not about non-stop shooting. In the beginning levels, the enemy ships are easy; not even firing at you. As you progress through the levels, the ships get harder and start to shoot at you.
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