I don't know exactly where he got his assets (or if he made them himself), but this guy https://www.reddit.com/user/QuaterniusDev/submitted/ https://www.reddit.

I don't know exactly where he got his assets (or if he made them himself), but this guy https://www.reddit.com/user/QuaterniusDev/submitted/ https://www.reddit.com/user/QuaterniusDev/submitted/ offers free assets in similar, colorful low-poly style