Scene Kit is Apple's new high-level 3D modeling API for iOS games. It's less abstract than OpenGL but still maintains much of its power. This is a good introduction to Scene Kit. You should watch and follow along and you'll be better prepared to use Scene Kit in your games.
It's always nice to take a step back from pure utility and read about some theory now and then. Neural Networks can be used in many aspects of game AI and in this article, Andrej Karpathy lays a solid but approachable foundation of understanding of Neural Networks. Read on and think about how you might use Neural Networks in your games.
Unity is a great IDE for developing 2D games. This year's recent release of Unity 5 brought about some great improvements in Unity 5's 2D capabilities including changes to physics, components and audio. Brian Moakley offers a good overview of what's new and how you might use it in your own games.