there are code editing apps for Android. Would creating stand alone applications be doable on Android?
Making a fully functional code editor for Android is a ton of work.
DragonRuby is not a visual scripting engine like Construct or Bitsy. You need an application that is able to edit text/code files (such as Visual Studio Code or Sublime Text).
What code editor do you use on Android?
I think Godot exists on Android. You might want to give that a shot :-)