The Gambit interpreter (REPL) itself also runs on the iPhone
https://itunes.apple.com/us/app/gambit-repl/id434534076?mt=8
and on the Android platform (updating it with the latest version of Gambit is on my todo list):
http://apps.keithflower.org/?page_id=152
http://apps.keithflower.org/?p=223
https://play.google.com/store/apps/details?id=org.keithflowe...
Note that this is just the interpreter itself - not a very good way of writing games for Android.