Thank you so much for your nice comment and the suggestions. Yes, interior and player/NPC sprites are planned. They will be additional asset packs in a similar price range. The interior pack will come out first and feature wallpapers, flooring, wall toppers, wall dividers, all kinds of furniture and decorations. I'll probably need 2-3 more weeks to finish that pack (no promises!) and then I will start working on player/NPC sprites with animations, hairstyles and clothing options.
An inventory will be added to this pack for free. I have sketched but I wasn't sure what type of inventory makes the most sense (equipping rings etc.)