Current version of raylib is complete and functional but there is still a lot of room for improvement. Here it is a wish-list with features and ideas to improve the library.
Note that raylib source code has some TODO marks around code with pending things to review and improve. Check GitHub Issues for further details!
raylib 1.x
raylib 1.7
raylib 1.6
raylib 1.5
raylib 1.4
Any feature missing? Do you have a request? Let me know!