Mega Typhoon is really amazing. I was shocked when I first saw it, pushing that huge amount of stuff on screen without slowdown. What the game really miss is a cool soundtrack though.
I always wondered, even more after seeing Mega Typhoon... with the correct compromises and team of competent coders, could we get a playable port of Batsugun? This is usually regarded as the game that made the transition of the shoot'em up genre from "Old school" to "Bullet Hell"
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We will never know