One remote debugger that I can think about is Eclipse connected via USB and debugging an app started by it on an Android device.
It might work with Tier 2, but I don't know about Tier 1 (since that is basically just an interpreter and it won't know what your original code was).
You can also use Xcode to debug Tier 2 when the app is started from Xcode on a connected device or as a Mac app.
But I've not seen anything about a built-in remote debugger for Tier 1.
Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master