VGFacts

In Metal Storm (NES), R-Type warships make a cameo appearance in stage 6. Both games were made by Irem.

http://m.youtube.com/watch?v=xkQcUFgoD0k
http://m.youtube.com/watch?v=9a_QQyFMIuQ

I wondered why the name "Metal Storm" sounded familiar. It's one of the few NES games my family owned. We never beat it, because we were kids, and it's a particularly tough game.

Yeah, it is. I never beat it myself, but I do remember playing it as a kid. I'd like to see some type of sequel. Is there a FPS that includes inverting gravity? Heck, third person would be cool. That could make for a sick game.