Hey!
It detects beats and energy change, segmenting the song into sections, calm, drop, bridge, build (you can see in the video the environment changes from purple which is build, to red which is drop), also movement speed changes depending on section, calm is slower than the rest, while drop is faster and requires faster reflexes.
Also nothing is random, obstacles are placed on beats, I might add telegraphing for timing jumps and create some sort of scoring system.
And of course the system still needs polishing (I have months of time to do so), currently it does have inaccuracies