I have made releases available to download here, effectively same as F-Droid, but easier for me to publish: https://github.com/hidroh/materialistic/releases

Appreciate the effort. Ive had lots of issues with other open source HN apps. This one looks and works great so far. Would've loved an fdroid release, but an open app with github releases is more than can be said about most other apps, so no real complaint there.