Is it just me or lately there are been many lottery s services appearing here on the gambling section of the forum?
It could be just some coincidence, but still catches my attention, it is a little bit suspicious, if you asked me.

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Anyways, welcome to the forum. Do your app have some repository so we can check the code and guarantee there is not something off with the apk? Many gamblers here are very careful with whatever they decide to download, specially because apks are a very common vector used by criminals and hackers to steal cryptocurrency and private information.
If you want more people to check your service out, then offer an option to participate in your lottery using a web browser or make your application open source. Being paranoid is the only thing which have saved many people holding Bitcoin from losing it all to scammers, hackers and fraudsters.

Cheers.