You think? I feel like there are already established platforms that exist for that (such as this one). There's also many ways to promote indie games such as through social media outlets like YouTube, twitter, discord, reddit, etc...
The problem isn't really having a place to promote indie games in my opinion, it's more the difficulty of making your game stand out and get recognized. A combination of a sticky game and marketing skills is what gets your game popularity. A platform can't really help you with that.