There are a lot of problem if you use firefox, some images are too big and prevent you from continue, and that happens in two differt path at least.
Also, a lot of images have the wrong case for the first letter, and so the browser can't find them. To make things even worse, or at least more tedious, some images require an upper case first letter, other lower case and other require the folder they are in to be lower case or upper case. This make any attempt to work around this problem vain, unless you want to edit the html file looking for and then editing every single link, and they are a lot.
I suggest the developer to stick with one standard, and maybe test the game before releasing