I haven't made any grammar or actual phonology or some words, but I did make some glyphs.

The script above is designed with the assumption that Viltrumites carve their glyphs onto objects with their raw fingers. Imagine a metal slab. A Viltrumite would use their index finger to carve almost-perfectly straight lines onto the scripture in the shape of these glyphs.

This can also be done on the land of a planet on a larger scale, by using their whole bodies. or theoretically with ink, but ever since Argall banned all art, literature, and things that give meaning to life that aren't combat arts, that's almost never happened.

Direction and orientation theoretically do not matter, since the script has been used mostly for military purposes and marking planets, but the standard orientation would be up-to-down, and every line break is reverse of that (ie. up-to-down, and the next line is down-to-up, and then the next line is up-to-down again, like how very very Ancient Greek worked).