Hi ! It's normal for new .exe to be flagged as suspicious, and I have some things in games such as optional analytics that could be flagged as trying to send data elsewhere.
If you aren't confortable downloading anything, play the game in the browser version. If you want reassurance about me putting out a virus; my goal long term is to sell games and currently this one is blowing up a bit, I would gain much less by putting out a virus and destroying my reputation.
Still, if you're not sure, play the browser version, it will be 100% safe for you.