A simple left-to-right blast where you have to deal with the scenery - watch out for those tricky moving platforms and fatal pits of spikes - and attacks from all sorts of (sigh) futuristic/alien sci-fi things.
It is, in fact, Strider, complete with all the (hnngh) 'quirks' these types of games have. I'm not a big fan of platform shoot-'em-ups. Unless they're done well (an example escapes me at the moment) they seem a wuss-out compromise.
Worse still, Auriga's control system is bugger. It's all very hit and miss whether you get the character to do what you want when you tell it to. Games like this were tired and old over three years ago.