Well
I can't see your whole gmail adress, can you please provide it? I will add you and you will be able to download it I am receiving testers through mail adresses so I won't be able to share you a google group for now.
Also I downloaded your app and tried it out.
I suggest you work on the UI UX a little bit more and add a cool onboarding page hyping/explaining the app etc.
(I am not a professional but I am reviewing it as an user. Some of my apps are realy trash and basic but it depends on the auidence of course and how much you want to invest in that app)