So i have a couple of suggestions to give:
Mobile port (i know you are already looking info it)
Personally id like to give it more kinks, like adding cbt, or breathplay, and being able to have modes for like 1 specific kink, so that a session is made completely around that kink for example having a cbt only mode, where isntead of stroking, you are supposed to hit your balls for example.
From my personal opinion i think having blacked cards would also be interesting
But the one that i think would be the best introduction to the game would be having a more custumizable play, as in being able to preselect rythms, and even to be able to make your own cards.