Well, it looks like everyday life has got in the way a little, as this short update, originally posted to the Remainder Software Facebook page reveals;
I thought you'd appreciate a quick update.
Work on our new title has been slow due to real life and illness but things have progressed recently. I've managed to add a control and jumping system and some very basic collision detection with platforms (there's a clue for you).
There's a hell of a lot more groundwork to be done before I have something presentable but things are happening. I will also give you more info when that happens too :)"
Although development has slowed somewhat, it's nice to see that the game is still being worked on, and if it's anywhere near the quality of their previous title, Downfall, you can be sure it'll be well worth the wait.
I'll have more news on this as soon as it surfaces.