They most certainly are working on the next episode as I posted Here.
They are also coming to Steam on January 9th here.
And they just released the iOS version which they notified me of today:
"The Journey Down: Chapter One" iOS launched!
App store link: https://itunes.apple.com/app/id580486267
We're cutting the price to $0.99 during our first week on the App Store. The game will later return to its normal price of $2.99.
I will post updates as they are provided but they are indeed keeping busy.