The X68000, a great system with a few good shmups. Of course there is Nemesis '90 Kai, the excellent remake of Nemesis 2, but there were so many others that should be known. Any longplay I find I will post here.
Forgive the quality, I wish there was a better one. This game has a good bit of Gradius influence but is unique in it's own right. I wish I could get the music...