If it works, then does not, usually due to a few things:
1. Steam download or update corrupted some files. They need to validate the files and identify if there's some errors.
2. Anti-virus software, such as AVAST is known to kill NWjs, just outright crashing it. Users need to make some exception for your game if they have some aggressive AV running.
3. PC infected with Malware/Viruses.