The Android App is in closed testing, due to Google requirements on testers before pushing an app to production.

You can join the group for the testers here

https://groups.google.com/g/atomicblendtesters

After joining, it will tell you that you don't have permission to see the content, that's okay, group is not designed to have content in it, just to determine who have access to the beta or not.

Then, you can download the app here :

https://play.google.com/store/apps/details?id=fr.atomicblend.app