I started to work on the intro during the summer of 2020 I think, learning to use the tools for fun as I had zero knowledge in it, and shared it towards the end of the year, and never stopped working on it since then.
At first it was motivated by simple frustration of not finding what I was looking for in any one game, so my curiosity pushed me to look on what was needed to try yourself at it, and just followed a few tutorials for starter, then I shared a crappy intro with a few ideas in head, never thinking it would really go anywhere more than a side project while I kept working on my art (I'm an artist and gallery manager as well), and to my own surprise it did talk to people, so I kept going and never stopped, and as ouch2020 said, it became plainly my full on job as I put nearly 13h to 15h a day in it.
And honestly it became a passion, I want to go explore new projects and create new games, but first, I have to finish Project Myriam, to prove as much to others than myself that I can bring a project to its end. ^^
Well, anyway, I'm glad you're enjoying the game and having fun with Myriam, I know it's definitely not perfect and I have a lot of thing to get better with, but it's always a pleasure to see people having fun with it anyway, I hope you keep having fun until the end and if luck has it, with the next ones too. ^^
EDIT: And don't forget, next update coming  into public access tonight past midnight (UTC+1).