I, also, could not get the .ppsx to run and had to use the html version, which feels a bit like a copout. I understand it's a last resort, but there are so many subtle things you can do in PowerPoint to give each screen some life and not feel like... well, like a slideshow.
I think the story is very charming so far, but there's something about the dialog that just seems off in a way I can't quite describe. Some of it just seems so unnatural, like no human being not reading a script would ever say it.