Create maps for Unity3D game

We need to create maps with style similar to the one in here https://drive.google.com/file/d/1dsu3V8561o8FwvEcdUAI8U6PCZA6zHB1/view?usp=drivesdk . This is for a game built in Unity, so the maps must be suitable for usage in Unity. Please only bid if you can guarantee that your output will have the same quality or better.