It's truly inspiring to see a project like this completed. I've been wanting to combine mobile (specifically Android) and some sort of Lisp dialect for a while.
Am I interpreting correctly from some of the other components that doing the programming in a language-once-removed (ie Scheme instead of Obj-C) opens an easier path to compiling for both iOS and Android?
That was part of my motivation for using Scheme, yes. Many indie developers are using the Unity engine which can compile to many different targets. (But that uses C# as far as I know.)
Am I interpreting correctly from some of the other components that doing the programming in a language-once-removed (ie Scheme instead of Obj-C) opens an easier path to compiling for both iOS and Android?