Thexder is great, but its main claim to fame is just how amazing it was in 1985 alongside compared to the other stuff.
The sequel Firehawk plays pretty much the same and isn't too much of a graphical update, but the stages are much more interesting and there is a bunch of fancy cutscenes. The music is also completely awesome. I think it was just kept as a PC-88 exclusive?
As far as mech shit goes the true masterpiece of Game Arts is the PC-88 version of Veigues though
Ara Ararauna, Blue and Gold Macaw, 32-34 inches
They are adaptable, and enjoy being in social situations. They readily become adept at performing tricks, and seem to love doing so. Cost:$900-1400