Cute read. Got like 6 different endings-- dunno if that's all of them, but either way that's enough for me. I quite like the Marisa headcanons ya bring up, as well as how the reader can choose the backstory. Marisa can have a wildly different internal journey depending on your choices, while still fitting in with what we know about canon Marisa pretty well, and that's appreciated. I do think the structure feels a bit too much like a checklist of semi-chronological topics, rather than a natural memoir, and it'd be nice if later chapters (other than the ending, of course) changed depending on your earlier choices. There's quite a few typos and grammatical errors, but eh, I don't mind it all that much.
In short, it's like a daily diary entry-- unconcerned with flowery flourishes, and charmingly honest.