Wild Guns is absolutely incredible and I cannot believe I missed it until now. It's the perfect challenge level, it has such variety of mechanics (I didn't even discover I could throw TNT back until I had to in order to survive a boss fight) and the soundtrack is out of this world. It's up there with Windjammers for me as a title that, if I saw it in an arcade, I would hunker down at the machine all day and play on loop. Definitely give this one a try if you love rail-shooters and are craving some variety within the genre.