I like how you made the floating island so I'm going to comment on that. I believe the island should have some vines coming down off of it, rounder shape to look more natural (as natural as floating islands get), and maybe adding a small pond would look nice.
Hi, I watched the video and I liked the project idea, I also enjoy the new biome. I think that the house itself is pretty good, apart from the color of the windows (I see maybe you thought it would look good with the wood, but I'm not a big fan of the color). One thing you might want to ad is a stable, as the dark colors of the horses would compliment the orange savanna biome. A enclosed gazebo by the pond would also be a nice touch to the property.