Most bad installs start with a file that did not come from the official channel. A forwarded message can use the Mast79 name and still put a different program on the phone.
Check the size
The official Android build is about 39 MB. A file that is only a few megabytes, or several hundred, is a reason to stop. Size is not proof by itself, but a large gap is a warning.
Check the source
Use the download page on this site and the official channel it describes. Do not install a package from a group chat, a short link you do not recognise, or a site that only copies the name.
Check the permissions
A game does not need to read your text messages or control the screen. If Android asks for access that has nothing to do with play, cancel the install and read the safety guide.
If you already installed a suspicious file
Remove the app, change passwords you reuse on that phone, and install a fresh copy only after you have confirmed the source. Sign in later with the login steps.