Copied from another response:
The Offline Browser version of Succubus Stories is compatible with the JoiPlay app (no plugins are required, just the main app), though you will need to make a few adjustments in the settings, including probably setting it up to play in portrait mode. Note that I have not personally tested the entire game in JoiPlay, so you may encounter bugs and other problems, but it does seem to work fine based on the testing I have done. The web version is also mobile friendly, and should work on most tablets and smartphones. Portrait orientation is recommended.
A proper Android APK is possible, but is very low on my priority list given that it’s only a slightly better solution than the other two. Probably when we get closer to a 1.0.0 release I’ll begin experimenting with support for additional operating systems and platforms.