Good shmups for xbox 360 at Japanese XBOX live store

[borislaw]

Does any one know if there are good shmups available (for 360) as DLC at the Japanese xbox live store that aren't available at the US store? I already have the region free Cave shooters... but what about DDP Daioujou, Espgaluda 1, Ketsui, or Cave Story (?- for original Dodonpachi). What about shooters not by cave?

[HydrogLox]

As a rule if the physical release was region locked then digital release is also region locked or worse - IP locked.
For more details see:
NTSC-J Xbox 360 owner's manual