This is yet another VSS (vertically scrolling shoot 'em up), and I expect you all know by now what the means: keep alive for as long as possible, avoid all the flak that's aimed at you and shoot everything that moves. The name of the game is points.
There's no shortage of VSS's at budget price, so it's comparison time: Hades Nebula is a cross between Moonstrike, Xarax and Xevious. Like Moonstrike it's monochrome, but like Xarax and Xevious it's a mite jerky. Unlike all three, the playing area is a full screen wide. The graphics are quite big and detailed - so it's nice to look at - but I found the action a little bit too slow. If you absolutely adore VSS's then get it, otherwise, well... that's you decision!