You can auto-update the game like Steam by downloading Itch app.
Steam itself has many weakness since the reviewing process are very biased against hentai anime style games, they also take down games that China government hates as well. There are many games couldn't make it Steam in first place, or might got taken off the shelves in for whatever sketchy reasons.
https://steamcommunity.com/discussions/forum/0/3398435622554724307/