I'm not aware of any other way to release Harem Hotel on Android.
Feel free to ask questions though, like "Why can't you release an android version like all the other developers?"
The answer to that would be that Harem Hotel is over 90 Gigabytes. The game has already been drastically compressed down to 10GB, and even with that, your android phone will only run .apks under 2GB. As far as I know, it is still impossible to make an .apk bigger than 2GB. It would be nice if .apk caught up to the modern year, but since Harem Hotel is big, it must be emulated on Joiplay.
Please let me know when/if you can get Harem Hotel to run on your phone without Joiplay.