You can find some videos on Youtube that give the game a bit of an hentai twist. Since all sprites are available to edit, you quite a few people have been making mods. The DEL button puts you in a debug mode where you can only be killed by insta-death attacks you'll probably want to turn it on when you get to some of the difficulty spikes, such as the slime boss. Keep in mind you can switch characters by pressing (I think) space on a save point you're much better off playing as the white-haired schoolgirl, since she can attack from a distance. The game is pretty playable too, although it's pretty difficult. There's vore, beating and a good deal of guro, all tastefully animated.
You play as one of two heroines, and go looking for treasure in some sort of dungeon pretty much every enemy has a ryona animation to put your character through.
Previously known as Ryonact, as far as I can tell.