Neverball

This game is doing it right. It takes and implements a simple, addictive, physics-based gameplay, which allows it to then focus on polishing the details. It's brief, no long tutorials, straight to action. The assets, the style, the menu, the sounds, everything is great and artistically consistent, which is very rare in open-source community. It looks very professional. I love the possibility of choosing the player avatar from a wide variety of very nice 3D models. I recommend to give this game a try.