Glad you are enjoying it, the platform doesn't have many games like this. Keep in mind that you can easily change the controller button prompts into PlayStation-style glyphs by adding UsePlayStationButtonPrompts=1 under the [Graphics] section of Sphinx.ini configuration file that you can find under $XDG_DATA_HOME/Sphinx/.
So, for example, if the file contains something like this:
You can add it like this, right at the top:
The next time you launch the game you should see them. Remove the line or change the 1 into a 0 to go back to XBOX glyphs. Also, someone added the same instructions here, too: https://pcgamingwiki.com/wiki/Sphinx_and_the_Cursed_Mummy#table-settings-input-additional
Let me know if that works for you!
Thank you very much for your advice, and, yes, there aren't many similar games; it plays really well about difficulty levels too ... just enough to not be too difficult, but enough to feel good about solving things.
I've done the following, booted up the game and seen it hasn't changed things just yet. Will try another boot. The controls are placed correctly eg press 'X' on controller makes him jump.
The Linux version is now live on GOG! Many thanks to @linuxvangog for all the help, backtrace and tips.
The pleasure is mine :)
Thank you for your work on this. Much appreciate. :-)