I'm not sure why you say it's a "quite safe" assumption that most games are written in C#. Unity's beginner-friendliness gives it a disproportionate presence online, while the vast majority of AAA games are still solidly C++.
If we eliminate all games with less than 1000 sales or something, I think it would be a very low confidence estimate.
If we eliminate all games with less than 1000 sales or something, I think it would be a very low confidence estimate.