Subscribe to the TouchArcade YouTube channel 12 minute gameplay alpha. Release date: Autumn 2016. More information later.
There's a lite version. It's pretty good, but literally very dark, as in sometimes difficult to see what's going on. I'm still not sure whether to get the full version as I don't know how long it is / if there are more interesting puzzles etc., but this dev does a good job of making games that are actually creepy. It's only a dollar right now so I'll pick it up, but might not have time to play it properly for a while.
