Galaforce for Game Boy

A Game Boy (original DMG) port of Kevin Edwards' 1986 BBC Micro shoot-'em-up Galaforce. It's written in SM83 assembly and ships as a 32 KB ROM with battery-backed saves (galaforce-0.0.9.gb). It's a personal project and not for distribution.

Game

• All 16 waves, with the original formations and flight paths, and a boss at the end of waves 4, 8, 12 and 16.
• Sprites redrawn for the 4-shade screen, with each alien type distinct in contrast.
• Music and sound effects recreated in the style of the original.
• The title screen has the scrolling starfield and a shine across the logo. After about 13 seconds idle it starts a self-playing demo.
• The score is at the top and the lives at the bottom, as in the original.

Options (saved to battery RAM)

• Lives: 1 to 5.
• Continues: 0 to 3, default 1. At game over, if you have continues left, it asks CONTINUE? YES/NO. YES refills your lives, keeps your score and replays the wave.
• Background: black or white (white is the default).
• Cheat: on the options screen press Up, Up, Down, Down, Select to unlock a WAVE row (1 to 16, not saved).