Unknown publisher. Please release a verified version.
I'd say the amount of people who've downloaded and played should be good enough proof it's trustworthy.
But if you're still worried just run some virus scans and what not. Windows also usually freaks out about random garbage sometimes. I personally had to add Battle Brothers to an exception list in order to get it to run with mods and my PC's been completely fine since.
Sometimes you just kinda have to take a risk and play it anyway. In those cases a virus scan before and a virus scan after is what I usually do. It also doesn't hurt to research the game beforehand, like taking a look at the Patreon, Subscribestar, itch page, and everything in between to make sure it's as trustworthy as possible. Could even ask around the Discord if need be.