I ve had the malware warning with the demo as well and not with the alpha neither. However, today the windows defender just deleted the soulash.exe by its own (I didnt even know that win 10 does that). It took me a while to figure out what the problem was. I "fixed" this by adding soulash.exe to the exclusions in the windows defender security center. Another thing to mention about this is that I usually keep my computer running for extended periods of time only going to sleep mode every once in a while. The sudden removal of the exe happened after a proper restart and while I was actually playing the game. It just kicked me out and the exe was nowhere to be found.
I hope that was helpful xD