Hey, thanks for taking the time to play our game!
The main art asset we used for this is called Treasure Hunters by Pixel Frog. The Camera is handled using a combination of Cinemachine with the PixelPerfectCamera component, as well as some custom logic for horizontal offseting. It took a moment to get right, thankfully there's a lot of resources online on those tools. We're very happy with the final result. No other magic here, hope that helps!