It’s not too old, but rather obscure. G-Stream, the only game from Oriental Soft, was one of the very last shooting games with 2D graphics without MAME emulation, aside from Cave’s titles. Supposedly, ex-Seibu (of Raiden fame) staff (which partially would form up later Triangle Service) worked on it. Though it lacks full sound emulation for now and seems there are some graphic glitches, as this screen shows, the next MAME version will support it. Now you know.