You can still get the apk on GitHub releases if you don't want to use Accrescent. Also you can use Obtanium to get automatic updates for many apps from different sources, including GitHub.
for real, like it's weird that it's on such a small app store without branching out to the other larger ones, it makes me think something else nefarious is going on. Not that it actually is but that's the look that it gives with something like this lol It's on my radar but I'm going to give it a bit before trying just in case