Hi VLKe. It's a Twine game. Once you have unzipped it with a dedicated app, simply run it by selecting the MuscleSculpt.html file in a file browser and use your favorite browser (e.g. chrome to travel into the game).
Indeed, you are right. Depending on the file loader I use, the pictures do not load (but I get access to the text at least). The applications which are working for me to launch the game on android are 7zipper followed by chrome or even joiplay. In a future version, I might embed the game within itch, though.