Note that the “modding” feature now is limited to editing the game’s source code, e.g. here https://gitlab.com/EugeneLoza/foxy-misfortunes/-/blob/master/code/gamecharacters.pas#L238 . If you need a “simpler tool” where you can get the result without recompiling the game (though after setting up the Castle Game Engine it’s relatively simple, unlike building for Android), ping me, it’s relatively easy to add this feature. I’m working hard on a new game right now but will distract back to this project if it’s needed.