Alien Onslaught

Alien Onslaught is a shooter game set in space. The player controls a spaceship and must shoot at hostile alien ships. Enemy shots deplete health and running out of health means the player's ship is destroyed. Power-ups can be collected during gameplay, which give new weapons, shields that protect the ship, health replenishment, an extra life, or automatic drones that fight alongside the player.

The game is "THEADOS Enhanced": after logging into an account created at the THEADOS Corporation homepage, the player could make in-game purchases for real money in order to buy new weapons, repair the ship or continue after a game over.