Perhaps, that was really all the Cave shmup games were listed in the Asian Games on Demand on Xbox Live Marketplace that most of those were released in Japan only. However, there's an IOS global release where it can be playable outside Japan. Unfortunately, there are flaws in this one. The graphics are in low-res form although the non-in-game graphics are in HD. Also, there's a lack of additional game modes like other Cave shmup games on mobile devices have, that is, the games ported from the arcades to mobile devices of course. Not even the sequel on IOS has those features as well.
Extra stuff to say from here. There was a re-release of the sequel on IOS as well as Android but it turned out to be a serious disaster as it was developed by some Korean company and that the IPs of various Cave shmup games are now in the hands of other companies. The core and new resources are still with Cave however in which they are used for Donpachin and the upcoming Cave shmup for mobile devices of this year, Mahouotome, which has the same settings as Deathsmiles. Better still, stick with the more accurate IOS conversion of Mushihimesama series or perhaps the arcade or Xbox 360 versions for better arcade experience.
