[TOMT][Video] French 2D animated concept/pitch trailer, boy seeks revenge against wealthy family who killed his father

I’ve been trying to track this down for a while and can’t find it anywhere.

It was a concept or pitch trailer (not a full film, I think) from what seemed like a small French animation studio, posted on their own TikTok and YouTube accounts. The full trailer was available on YouTube.

What I remember:
* 2D hand-drawn animation, gothic but not dark or oppressive in tone
* Mostly monochromatic or very muted color palette
* A lot of garden scenes, part of what looked like a manor or estate
* The main protagonist is a young boy
* His father has died, and it's implied a powerful, wealthy family was responsible
* The boy has allies who are guiding or advising him on how to get revenge
* Little dialogue, but the music was really standout and pensive
* In French with English subtitles
* The TikTok post didn't have a ton of interactions

I thought it was from Gobelins but checked their site and it wasn’t there. It seemed like a smaller independent studio pitching an original project.

Any help is appreciated, this one has been driving me crazy!