Is the GameBooster 3 App by burakgon safe?

So as the title suggest, basically I installed this app since it seemed to have high ratings in the Play Store (4.7 stars averaging from 13.5k people) and claims to boost performance of any device that is rooted for gaming. It seemed safe at first glance and so ahead I had gone to installing it and when I opened it up, it asked for root permissions to which I allowed it (in Android 6.0.1 where root is supported natively). After that I was introduced to three options: 1. Ultra boost, 2. High boost, and 3. No boost? So to use the Ultra boost option, you had to use 3 credits (and you are given 3 credits for free), I thought nothing of this and so I wanted the option to have a limitless ability to the boosting option so I paid £1.55 in the options menu and after payment was successful, I wasn't actually given "unlimited credits" as I was promised, instead, the credit counter got set to 1000000. At this point I was very skeptical and had a feeling that the developer is a scam. I deleted the app and installed it again later, upon re-installing, the credits I had paid for were all gone. I am worried that maybe me giving root access to the app has given the developer access to my personal info.

I then also realised that the reason why the app had so many high ratings was due to the fact that the developer promised inside the app for people to received "5 free credits for rating the app 5 stars" in the play store. This further fuelled my suspicion and am worried. Can someone take a look at the app in the Play Store and give me their take on it's validity?

It is called "GameBooster 3" and the developer is "burakgon".

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