When you start the game, the floor is not displayed and the character falls.
It seems to be incompatible with my PC environment and there are others who have encountered the same bug.
This issue is most probably caused by the game being placed in a folder that has read/write permission conflicts. Could you try to place the game files in a folder on the Desktop or the C:\ root and see if that helps? Alternatively, does the data\ folder contain a file called just "map"?