The goal of the game is to reach the bottom right cell from the top left cell as fast as possible.
The mazes seem to quite strictly be 4D mazes: there can be 8 possible directions from a cell, An absence of portal being the equivalent of a wall.
It's possible to make smaller (and easier) mazes by starting the webpage from a small web browser window.
The maze generation algorithm is using priority queue with random weights, a variant to the often used DFS algorithm.
Easier difficulty means less probability to create portals during the maze generation.
You can suggest improvements to this game, contact: etin.jacob (at) gmail.com