I was also looking for a way to get notified of every new app review so that I could be sure to stay on top of my customer's feedback. I tried out the RSS feeds pointed out by mattio but the downside with that is that you have to monitor all of the countries separately and there are well over a 100. I ended up making a tool called AppReviewBot to make this process super simple. If your team wants to receive mobile app reviews as soon as they happen in Slack or Microsoft Teams, check it out!