The Last Tempest (X68000)

This is a game that was almost, thanks to the short-sightedness of its developer, lost to the ages. It's only down to a helpful poster at the Tokugawa Corp forums, who found a way round the game's copy protection that it can now be emulated, played and written about.
On to the game itself, it's an action game taking place on floating isometric islands, and on each stage, the player must find and kill all the enemies therein. The hook is that the player is some kind of evil skull-

worm-thing, and the enemies are angels, saints, apostles and other biblical figures. Enemies are killed simply by repeatedly ramming them with your face. The game delights in being disrespectful and irreverant, too: cherub enemies are labelled "angelic scum", the good samaritan is pointed out with a big red arrow instructing "KILL HIM!", and the homing shots fired by the Archangel Gabriel are "angelic sperm".
The game is a lot of fun, and though the stages all have the same basic goal (kill every enemy), there's still a lot of variety in them, and another nice touch is that though each stage has a boss (usually an archangel, though I've also encountered a bronze serpent summoned by Moses and Aaron, who also float around on their own little island summoning explosions and rains of holy water to further annoy you), they don't have to be killed last, and will often roam about the stages attacking at will.
Another interesting point is that the player character is technically invulnerable to direct attacks, with death only coming from falling off the islands, which actually serves to make it more annoying, especially when, as is often the case, death comes from the player's own clumsiness, without even needing any enemy

intervention.
Despite this frustration, this is a game I'm going to be sticking with for a few reasons. Firstly, the charm of its adolescent blasphemous trappings (as an aside: though it came out in the same year as Neon Genesis Evangelion, since that series debuted in October, it's probably just a coincidence), contrasted with the high quality of the graphics and music and how well put together the game is in general is nice, and secondly, as I said, every stage is unique and full of nice little ideas, and I want to see more of what the game has to offer.
Special thanks to Japanese PC Compendium for helping me get the disc images and the save state needed to run them.