wefwef is based on Ionic, which has support for material UI. In fact, it's just a switch to turn it on. :)
I just have to go through the app and clean up styling inconsistencies, but yeah, material design is totally doable!
As for being on the app stores: That's a big maybe, and also a very low priority at the moment. But Ionic does make this pretty easy as well.
However, being a web app allows us some freedom to implement some cool features. For example, we could embed piped.video for ad-free, privacy respecting youtube videos in app. That would never fly in the app stores. It would also set wefwef apart from the native apps.