MIRU is my absolute favorite solo TTRPG. It has a chewier experience than many other solos out there, an incredibly satisfying game loop that makes you want to play one more turn, then one more turn, then one more...you get the idea.
And while there is a lot of game here, there are plenty of RP opportunities as you think about your character's experiences wandering this world in order to kill a god.
I cannot recommend MIRU enough. 5/5, 10/10, all the numbers.