A great improvement to the platform would be the ability to add reviews/comments to the extension. It shouldn't be used as a place to seek help but instead to express your opinion and suggest improvements which can be read by the author.
While Extiverse isn't an official part of Flarum, it would be an amazing QoL to be able to login with your Flarum account. At the moment the extension site doesn't look much like Flarum at all, none of the recognisable elements are present, not even the branding colour. It doesn't have to be a clone of this forum however it should invoke the feeling "Oh, this is clearly for Flarum." when looking at the design.
The most prominent example of an extension site that I like would have to be MyBB's Extend, perhaps you could take some inspiration from what they've done? MyBB Extend. Everything is laid out very clearly and you haven't got to guess what the icons mean.
You've done a great job with the site so far but I do believe there are improvements that could made to make it even more impressive.
