Theirs a problem with the Android version hopefully it will get fixed soon.
Viewing post in Gacha Neon 【ver 1.5❣ Beta】 comments
Not to be rude but it's not the supported platform either yeah I get it's for 32 bit but the app itself is on google drive and many are struggling to get on the google drive and once they are on it many will see that they still can't get it because it always says "app not install" which leads me to believe that the file itself is corrupted.