Grimm's Hollow: Pocket Goods is a fan pack! Inside is: 

- a 10+ page art booklet full of new illustrations and coloured concept art, with some commentary about the game's development 

-  3 high resolution wallpapers for mobile and desktop 

- the developer's (icky) heart 

The game is free, but if you pay $8 + USD you can support the developer and unlock Pocket Goods. You can also support the composers on bandcamp.