I can explain everything

What are the requirements to beat the game? Also, what's the use of those floating cubes?

to finish a level you have to find the golden floating cube

each floating cube removes everything with the same color as the cube when you touch the cube so every floating cube that you find and touch opens new paths in the labyrinth

the game is really non linear, there are many possible solutions and some are faster than others. That makes the game especially interesting for speedrunning because you can always find a new route and improve your time

What about the rings?Teleport me to a random place?

yes exactly you get teleported

the fun thing is you never know to what place :D

I see. Thanks