The gameplay is engaging, the music is excellent, and the scenarios were interesting.
If I had one complaint, it is that one cannot cancel movement after making it. Otherwise, the mechanics were solid and quite easy to understand.
You're right that a writer could have helped this game shine even more, but for a solo project, this is quite impressive and high quality!
One note: I think you're using "Deplacement" to mean the number of tiles a unit can move - this is a very uncommon word in English, and something like "Movement" might be easier for English-speakers to understand.