Game Design Resources
- Game Feel - Steve Swink
- Masahiro Sakurai (There are very practical, high level lessons to be learned for push/pull or risk/ reward design principles & and tons of miscellaneous polish tips and tricks)
Technical Resources / Engine Development
- Foundations of Game Engine Development - Eric Lengyel (Volume 1. has some nice Geometric Algebra resources too)
- Game Engine Development - Jason Gregory
- Game Physics Engine Development - Ian Millington
- Real-Time Collision Detection - Christer Ericson
- Real Time Rendering
- https://engine-programming.github.io/