...and that mood is primarily, "Damn, those are some creepy costumes!".
Crowman & Wolfboy are on a journey to find humans while trying their hardest to escape the darkness. What gameplay is shown in the trailer is intercut with the aforementioned creepy costumed characters, but the whole ensemble is quite good at evoking a growing sense of unease and dread. Watch the trailer for yourself to see what we mean.
The game is out on the App Store today and will cost $2.99. It looks like there's some interesting tandem moves between the two characters, and that alone might be worth a play of this macabre escape from shadow.