There are the possibility that they are false positives, but "The anvil section" is marked by windows defender like a trojan, and "un petit noel" have 3 alerts in virustotal, looks like a game made with game maker, so maybe be a pirated version,  that is a only a theory, nothing confirmed because i not put these games in some of the services to test malware. Is better to have a computer apart or a vm to play games of game jams