Any reason this is not provided for download through F-Droid. I trust apps on F-Droid more than Google Play and helps with installing in degoogled phones.
Downloading the APK direct from GitHub is the official way to get it without the Play Store. App updates take a bit more work, but you can set up notifications through GitHub to be notified for new releases.
Just FYI, there's an Android app called Obtainium that lets you add Github (and a few other VCS) repos to it. Obtanium will then check those repos for updates and install the new APK for you. Its pretty slick for people that prefer to get their APKs direct from the dev.
I like Fdroid because it automatically compiles from source and does vulnerability scanner. Its not a safe practice to download random binary blobs from github. Its a shame it looks like a nice implementation but I will have to give it a pass.