Space Manbow by Konami was a great shmup that shared a lot of family resemblances to Gradius and Parodius. It featured a very similar weapons system. A great game and a must-have for any MSX2 owner who likes shmups.
Sadly this game never was released outside of Japan.
It did come out on cell-phones/mobile phones in Japan in 2006 and it came out on the Wii's Virtual Console in 2009, sadly also Japan only.
The game only comes on cartridge and it features a special SCC soundchip that greatly enhances the sound capabilities of the MSX2 platform. A great looking, sounding and playing game.