Bionic Heart has 24 different endings and I've gotten a few of them so far. I got a few other Visual Novels when I picked up this one - another one is "Scar of Doll" which is actually better than it sounds - it was free and so far has not asked for any money - which all of them except for this one have done.
However, the price asked is pretty nominal - 3.99-5.99 - which compared to a Visual Novel on the 3DS costing $29.95 - $49.95 is very good.