Defendroid

Defendroid is a single player, Windows port of the classic arcade game. It is an updated, renamed version of Glen Summers game Defender.

The gameplay is virtually identical to the earlier version but the graphics have been updated, the game has been renamed, and a new help system has been introduced.
Players fly over a mountainous side-scrolling landscape attempting to prevent aliens abducting people. When enemy ships are destroyed the people they were carrying must be collected before they plummet to earth. Above the game area is a radar view of the game area so that the player can see where the enemies are and anticipate their arrival. The game gets progressively harder as the player moves up through the levels with later levels forsaking the earth altogether and being conducted in space against swarms of aliens.

This game has some interesting features not usually found, for example the game can record and play back the last successful game, it can display the CPU resource usage, it also allows the player to configure the sound, the display and the controller and to create and configure patch files that affect the look and feel of the game.