Unfortunately, no. After some attempts and testing, it's become clear that I'd have to eliminate core gameplay elements to streamline things for the smaller screen, which means re-balancing everything to make a worse game with less player agency.
Additionally, making the options viable for thumbing instead of clicking means rewriting the game from scratch to use imagemap selection instead of Ren'Py's default menu choice selection system. I'm not going to build a scaling omniscreen compatible GUI and rewrite the whole of the code.
It annoys me too when a game on Itch I want to play isn't browser or phone compatible. But, unfortunately for this game, them's the breaks.