once you have looked (right click) on the sofa, the throat sweet will become collectible on the sofa cushion.

EDIT - Just wanted to let you know that it is nominated at The Game Development World Championship. If you have a moment to help a new indie game dev out, please follow the link and click the vote button https://thegdwc.com/games/last-christmas

Hey! On the overworld map you can find the button to change loadout on the bottom left. In order to unlock the new abilities you have to complete more levels!

Good luck ;)