Deluxe Galaga (Public Domain)

From MobyGames:
'Norway's Edgar M. Vigdal has converted several classic arcade games to the Amiga in his Deluxe series. Deluxe Galaga is a thorough remake of Namco's classic Galaga, with lots of new nooks and crannies.

Just like the original, the main game play revolves around the player's spaceship, which can only move to the left at the right, firmly situated at the bottom of the screen. At the start of each screen, an enemy wave comes flying from one or several directions until they form a tight formation at the top. One after one, they swoop down towards you and fire. If they reach the bottom of the screen, they wrap around to the top and revert to their original position. There are lots of enemy types with various kinds of armours and missiles. The gameplay is spiced up by giant enemies joining the formations and a flying saucer that flies across the top of the screen, firing target seeking missiles.'

The game is played twice, one time with music and one time with Sound FX!