I work on this for fun. Blame Julie for asking me to share it.
Make sure you have SDL2 installed somewhere. I just used vcpkg. You should also copy SDL2.dll to the libs folder. After that, run CMake, build it, and pray to the machine gods.
This gentleman's channel is where I learned most of the OpenGL stuff: https://www.youtube.com/user/makinggameswithben
The CMake scripts to find SDL2 are from here: https://github.com/tcbrindle/sdl2-cmake-scripts
If it's called RhythmGame, that's because originally I was going to make just that, and changing the folder name broke something that I can't be bothered to fix at the moment.
Oh yeah, don't talk to me about the lack of a src folder. I'll get to that eventually.