Like most mobile games that claim to be free, State of Survival tries to tear your soul out, the game itself is addictive and very competitive, at all times you're competing to have the highest base level, the highest troop level, to have the latest hero released... And to do this you can't miss any events, and you're bombarded with events, you have to buy packages to get an advantage... In other words, the game forces you to enter the game all the time so that you don't fall behind.
And that's not all, the further the game goes into the late game, the worse it gets, because it's clan wars, they invade your base, all the time someone is attacking your clan, all while you have to find a way to get resources to continue improving your base... And when they attack you, you lose your resources, so you have to be smart.
I remember playing this game a few years ago and I abandoned it because I couldn't stand the stress and anxiety it gave me, but a few days ago I saw it on steam and installed it, I got hooked, but the stress and anxiety was so high that I decided it was better to abandon it again, in 5 days my steam account is showing more than 50 hours played, part of that is that I forgot to open it, but even so it's a lot.
Image from playstore, I won't install it again.What's worse is that the game isn't fun, it's competitive. Another game that gave me a lot of anxiety and stress was League of Legends... A waste of time and addictive. The advice is, stay away from these free games, the price you'll pay is much higher than buying a game.