Someone recently found a bug in the game during the Labyrinth. PLEASE DO NOT PRESS C,V, OR B WHILE EXPLORING THE LABYRINTH. Doing so will allow the player to exploit the game and zoom out and see the whole labyrinth, also it consequentially reduces the movement speed drastically making searching the labyrinth a literal hell. Unfortunately I cannot fix this considering how Unity changes aren't able to be saved if going back to edit in SGB.
Also: There are 5 stones to collect in the labyrinth. I highly recommend, if you plan to collect all 25, to find the 5 stones BEFORE entering the portal, the reason for this is due to another small bug where returning to the labyrinth post game keeps your movement speed at 2 rather than increasing it to 3 to allow for faster exploration as originally intended.
Lastly: Just FYI there is post credits content.