I am not one of the devoloper, but I can tell that: the game is definitely not scam. I played a lot and also have I wrote a lot with an ex-employee. Everything is serious.
I know that it gets in quarantine after downloading so it might be awkward and not trust worthy but I can tell you this is just an installer.exe nothing more or nothing less. It's simple as that.
Wether or not you install it is up to you, but I hope that this helps you with your decission.