Welcome to the world of the modern Roman/Latin alphabet. It is many centuries before today's era, and the letter J has only been recently added to the German alphabet (soon to be acquired by the French and English).
The entirety of the Game of J was created on the Unity Engine as well as it uses the 2d Sidescroller asset package. You can find the package using this link:
This game is entirely satirical and made to get more acquainted with Unity. The game can be loosely compared to a game in the Metroid series. This being, the game is a non-linear 2d sidescroller. Another way to look at the game is somewhat of a maze. It's recommended you take the 'maze' comparison as more accurate than the comparison to Metroid.
I plan to release this sometime in November, but due to my knowledge of game development in engines like Unity, there's a chance this game will be delayed, or even just not released.