it’s BUG from silhouette mirage!
Back when I was a LONELY TEEN I mastered this frickin’ game to a degree that I have difficulty comprehending nowadays - last time I played it I just barely made it to the second level before I started sloughing off lives like nobody’s business. Don’t really have the time or patience to relearn it, either.
Oh well. I’ll always have the memories (and at least a few old sketchbooks cluttered up with ONE ANGEL WING/ONE DEVIL WING monstrosities. Because for some reason what I took from it was “DUALITY IS DEEP, MAN” instead of “WEIRD SHIT IS GREAT”?