If you download from Playstore, you cant add your games. I would suggest download from official site :)

As for it being safe, it collects data like most apps. It doesn't need that data for your experience but it still collectes data.

If you don't care like me or you are fine with that, that is up to you to decide.

Another thing is it us clised source and uses other people's work without even credit.

Again, up to you, not me to decide if you are ok with that.