This is the kind of comment to ignore. I think he doesn't know what " create an engine " means in terms of money and time. In his case , he must criticize a vast majority of games that are made ??with engines created by others ( Unreal Engine , Unity , Crysis Engine , Havok and many others ) .
His lack of argument is typical of basic troll.
IMO, your game seems very worked... Do not worry about the behavior of such people