I think you will like - Ninja Kid. Just seen it posted in the App Store. It is 3D. If you like Subway Surfers & Ninja Slash... This is both combined! Worth checking out!
Turd Birds Dead serious, by the way. Ridiculous game, but something about the mission system and the sense of progression through the levels feels great. Oh, and... PITFALL! Forget its appalling F2P system, the game itself is one of the best behind-the-back runners out there.
Since January this year i'm doing a huge, and i mean a really huge cut in my library of games. Comes down to about one hundred apps left. Six runners, and i bought/free and played them all since May 2010, survived ! Blood Roofs, Pitfall, Rōnin, God of Blades, Darkness Rush and last but not least Canabalt (what a soundtrack!) Edit: Missed a bit the 3D topic.
^Great list, but op said 3d. I guess he can play God of Blades. I guess that means i can suggest Infinite Warrior and TMNT Rooftop Run too