We provide a list of companies that developed abandonware games.
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Alien Swirl is a fixed screen shoot 'em up in the style of Moon Cresta and Phoenix. The player controls his ship along the baseline and has to shoot the aliens swirling above him. There are a number of aliens in each phase and the player has to shoot them all down to move on to the next phase. The first wave only has three aliens, but as the player progresses through the waves the number of aliens increases. There is also a Space Invaders-like mothership that occasionally moves around the screen. After every four waves there is a resupply phase in which the player has to dock his ship to a tanker. The operation is similar to Lunar Lander. Bonus points are awarded based on how well this is done and every 10000 points the player gains a bonus life.
Fortress is a clone of SEGA's Zaxxon, copying many elements of the original game. Using an isometric scrolling perspective, players have to guide a spaceship through a course. It is filled with enemies, such as stationary turrets, spaceships and rockets that are launched from the ground. There are also many obstacles to avoid. Instead of just shooting at anything that moves, the player also has to shoot at fuel barrels to fight the dwindling fuel supply. The ship can also go up and down in the air. In this way many hazards can be avoided, but a lot of fuel is consumed. It is often necessary to fly higher to get over walls and through narrow doorways. When the game is completed, it restarts immediately. The player has three lives.
