If you like your visual novels with plenty of sex scenes and very little plot, then I guess Cat Girl Alliance will be appealing. The limited amount of characters, futanari elements and lack of anything interesting happening beyond the sex scenes will however limit the audience of this game. While not the worst visual novel that I have played it is nothing special either.
Gameplay: Non-existent and with a bare bones storyline as well.
Graphics: Quite dated and the art style is a bit hit-and-miss.
Sound: A few nice tunes, but overall unremarkable