No app is safe from being decompiled. If somebody really wants to do it, they will find a way.
The first question is how desirable would it be to decompile your app? If somebody could spend time decompiling GTA V or your game, which will be the priority?
If it is decompiled, what will you lose? It is quicker to recreate a game than decompile, and rewrite the result in a way that can be reused.
If you have user/password data inside your game, then that is something you need to consider and protect.
If you look at the media/byc file, then you will see it is not human-readable, apart from the list of included files at the top. It would take some work to decompile and rebuild the logic.
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Quidquid latine dictum sit, altum sonatur
TutCity is being rebuilt