Signol_Games thank you for playing the game, and I am glad you had fun with it!
To me it seems like the right and the left are the same level but mirrored, right?
If you mean with mirrored that the left and right chapters are the same, so yes they are same.
Why?
As I mentioned before, I included the "Parallel Universe" theme on my game which is an optional theme, and the game matches the theme like this.
Is the level progression different based on which direction you favor?
Yes, it is!