Excellent job with the transition of scenes. Very hilarious game!! I didn't expect the "go around the world" thing haha.
I can see some gaps between your tiles and the solution can be simple! Just create a Sprite Atlas (In the assets folder -> Create/2D/SpriteAtlas) and where it says "Objects For Packing", drag and drop the tile's sprites (Use the lock on the top right of the inspector to make it easier ). Finally click on "pack preview". Hope this can help you!