Well done, this is a really impressive prototype. I think the game has a lot of characters already and that the Rat can be a really cute character. I am interested to see what the relay part of the name is.
When I first read the description I thought that the puzzle/maze would be very simplistic, but it's amazing how complex those few simple rules make the game. I can't wait to see how these mechanics evolve as the game grows. Also for the LORE, does the rat get the cheese in the end or are they for ever chasing it into more complex mazes?