I see these are billed specifically for Godot but would the graphics style still be useful in other engines like Game Maker? Beautiful beautiful assets!
Viewing post in Ornate Pixel Art Theme comments
The graphics is just a png file with all the needed to make the controls. Honestly, I don't know how the Game Maker UI system works. I shall investigate that. But the png file I guess can be imported and used in any engine.
In this case, I tagged it for Godot because the zip includes a ready-to-use godot resource, that you just drag and change the theme to all the controls in your scene. If I'm able to do such a thing automatically for other engines, I may include those in future updates.