Honestly it's best to get it here. The game usually updates every 28th of each month and while I don't know if steam updates the game I do know that itch.io will update. You also will get a link sent to you via Gmail. It will act as a key to instantly update the game. When the game updates simply redownload the game to get the new content. I recommend that you do not delete the special link. Nothing happens if you do but it's better safe than sorry. Hope this helped you out.