The tutorial does explain that the small numbers represent the other sides of the die. Therefore your top side becomes the side opposite to the direction you moved in(move right --> left side becomes top). I'll write an additional explanation in the description.
A lot of these issues would be solved in 3D, but I have no experience with making 3D games and I really wanted to make the concept.
I'll definitely work this into a more complete game after the jam's rating period finishes.