Hi! Sorry to hear you're having problems launching the game. Can you please share more information? Maybe you need to deactivate Play Protect and reactivate after. You can try to redownload.
About the size, Celebrity Hunter development is focused in mobile first. We optimize all imagens and videos to webp and we can achieve a really small size with LOTs of content. You going to get hours and hours of gameplay and new episodes are coming two times a month, so expect more and more story as the time goes on!