The game uses a custom native launcher with protected packed resources instead of the standard RPG Maker/NW.js executable layout.
Because that launcher is custom and not widely known by antivirus databases, some AV engines may flag it heuristically as PUA/RiskWare/Trojan. These are generic heuristic detections, not confirmed malware. The build does not install anything, does not add startup entries, and does not include miners, stealers, remote access tools, or anything like that.
So yes, this is a false positive caused by the custom protected launcher/resource container.