Three minor tweaks to this top down shoot-em-up:

Hidden messages: Easter Egg text embedded in the loading screen has been revealed

Autofire: Hold down fire rather than tap to shoot

Bomb: Use second button on a Mega Drive, CD32 pad or similar to bomb (also can use space)

Although only an ADF is provided, this can be used with the WHDLoad slave. Replace "disk.1" from a WHDLoad with this ADF.