A really solid first build, made me intrigued to read more! :-)
I enjoyed the writing a lot. I especially liked the relationship between the MC and Erwan, they had great chemistry and an interesting dynamic, and even though I'm guessing we won't be seeing Erwan again, this makes me confident future characters are going to be interesting as well.
The setting is also pretty interesting, the marks remind me a lot of the dragonmarks of Eberron fame.
The VN has room to grow in terms of visuals and music, but what was there was serviceable, and I'm guessing you are going to have more assets to play with once we get to know the other main characters.
One small thing that was pretty noticeable while playing is that Akhet's sprites are not aligned, so every time his expression changes the whole sprite moves slightly. I would suggest fixing that because I doubt it was intentional. :-)
Keep up the good work!