Fortress

Fortress is a clone of SEGA’s Zaxxon, copying many elements of the original
game. Using a scrolling isometric perspective, players need to guide a space
ship through a course. It is filled with enemies such as stationary turrets,
space ships and rockets launching from the ground. There are also many
obstacles that need to be avoided. Instead of merely shooting anything that
moves the player also needs to shoot fuel barrels to combat the dwindling fuel
supply. The ship is also able to move up and down into the air. That way many
hazards can be avoided, but it consumes a lot of fuel. Flying higher is often
needed to move over walls and pass through narrow gates. When the game is
completed it immediately restarts. The player has three lives.

Fortress