Well it's a side scrolling shooter rather than progressing heads up in vertical orientation so it might have been a rather bitchy way to control the ship but maybe I am wrong? I only played DoDonPachi and Espgaluda - maybe CAVE has other games that are side scrollers. Which brings me to question, having iPhone 5 the best DoDonPachi version to buy is the more expensive, HD one, right? Also any of the CAVE games with widescreen support?
http://www.siliconera.com/2013/07/23/soulcalibur-2-hd-online-gets-a-large-batch-of-hd-screenshots/
Please namco, bring it to iOS. I know, a fighting game on touch screen, but I'd kill to have my beloved SC2 on my iPhone...