OK for Oxenfree, there should be a listing for the game in Steam category. Then the other portion goes into swag category.
Remember, this isn't about what you feel you purchased, but what the item actually is. I know you bought this because you wanted to buy a game and get this extra stuff. But that was not how the item was delivered. And creating separate entries for these things are not alien. It is no different than the reason why we have separate entries for bundle exclusive carts outside of the bundle entry.