Not familiar with that game, but a quick google search gives some nice screenshots.
I think it would be possible to do a reasonable master from the foam it for the purpose of a floor tile. I assume you would use some kind of pouring silicon for the mould? In this case there would not be much pressure anyway I suppose. Sounds fun.
You can get a board 2 by 4 feet of the foam from ebay at £2.50 including postage, search for “Electric Underfloor Heating Insulation Boards 6mm for underfloor heating”.