This is an excellent solo/journalling game about reflection, the passing of time, and memory. 
The prompt questions build a tone of somber, poignance, and that fine line of leaving space for solitude without loneliness. 

I've only been playing Solo & Journaling RPGs for a about a year or so now, and this is one of the first games I've managed to play through to the end state as written. I VERY MUCH appreciate the the default setting of responding to 15-20 short prompts as the length of a game. If you're looking to explore a Journalling RPG that you can complete in 1-2 sittings, play multiple times with WILDLY different outcomes, & feel out your imagination without feeling like you need to get SUPER detailed? This is a GREAT choice. 

Right not Sentinel is the FIRST thing to come to my mind when someone asks, "What's a good first Solo RPG?"