This is pretty neat, and cool as a design style for doing "tilesque" types of drawing. Would there happen to be a way to add your own tileset, font, or tile atlas? Would then allow for rather quick tilemap creation (GB, NES, SNES style; a lot of cell phone games, many Steam releases, ect...). Lots of market. 500 games released last week on Steam.
https://steamdb.info/upcoming/?lastweek Out of the 28 so far today, 6 appear to be tile based.
If not, may borrow at least some of the design features for a project, as with a bit of simplification in a few areas, and changes for cell phones, it would actually make a nice way for users to interact with tile based games. Place an object, move an object, flip an object.
The tab based design and layout also works nicely desktop to phone for the most part, which is a nice plus for adaptation.
Anyways, neat tool, and especially design flow and layout. Also, the 15 pages of font use on https://velvetyne.fr/in-use/ is pretty crazy to look at.
EDIT: Also, to the author of Teranoptia, the licensing layout is actually rather nice and really clear about uses immediately. Lot of the web has vague license names, yet the direct use listing is beneficial.