Added fullscreen support and wrapped it in a launcher for file selection, courtesy of PickleLauncher (helpful utility for precisely this sort of thing in the Open Pandora scene..)
BTW, I wanted to say that I think that Lua as a first-programming-language for kids is a great idea! So much easier to explain a Lua table to someone than types and so on .. And quite performant, in the end, eh? I've been using MOAI for cross-platform game development, and now your little project is going to get some love in the homebrew sense, too .. what about adding sound at some point?
EDIT: just wanted to add, it works fabulously on my Open Pandora console as well!