The Android version of HyperRogue, as well as the free version, have been updated (to version 5.5a)!
This brings translations, two new lands with new mechanics (Cocytus and Dry Forest), the Euclidean mode, and several other minor improvements to free and Android players. Additionally, HyperRogue Gold now has access to online achievements and leaderboards, via Google Games Services.
Have fun! And buy the Steam version too! You not only get access to Steam leaderboards and achievements, but also more interest on Steam generates faster development of new versions (currently five new lands are planned!).
The full changelog from 4.4 to 5.5a on the blog.