Rating system can and is used to punish developer. Player may simply not like your answer and in result you get 1 star rating + insults in review. For most of games current rating system is not problem, but if your game is online shooter where players can get punishment for bad behaviour, or cheating, then it will be problem.
You must do one of 2 things:
1) rating system must ignore 1 star ratings when 75% (or above) ratings are 5 star
2) replace 5 star rating system with simple like/recommend button. More likes = higher in ratings. Such system will be perfect for itch.io