Harmony - Troop Symmetry

If the changes are only graphical and visual (new icons, new skill names), then there will certainly be no problems adding your work to the game, but if the mechanics are affected (changing skill connections), and also if you want to introduce new spells and abilities, then I see some problematic aspects in this.

What exactly is the problem? The spells are not new, but modified (for example, Blade is a former Hive - essentially, you can make any object and give it any attacking cast). Connections are easily redone - there are many of them, and it takes a lot of time, but there is nothing difficult about it, and it works without any issues.