We are working right now on better LOD for the furniture, the windows might actually by impacting it more than we thought too.
The NPCs won't change much until we finally have time to do a full overhaul on the AI, we are not happy with the current state, but the overhaul will take months.
Also you could just click on Tiana's map icon to get a guide line to her, it is explained in the tutorial when it tells you to speak to every NPC.
Right now the Fairy points out new critters, shimmering critters and plays with poofah, you can also headpat her by holding F and dragging the cursor over her head gently, the headpats and cheekpinches will influence her behavior based on her last action.
My brother was messing with the grass before we got a deluge of bug reports that needed urgent fix, maybe he left something unfinished there.
The fairy wing is easy to fix, it is probably drawing in the wrong layer I will check it.
The movement will have more use once we open up the map, after the Fairy colony feature we will start expanding the world, we will also remove the placeholder cart and mine to add real trees to cut and rocks to mine.
Thank you again for checking out our game Tomo!