Wow! This would be pretty cool. I need to update one of my games.
But some haters may create a rude project, then to subscribe and remove the words they said. I think (if you create this feature) you should add a function that shows the edits.
I think to allow subscribers to see how many followers do they have would be great! We were waiting for it for about 2 years.
Also, you can create logarithm function. It will motivate people that like to use advanced maths in their projects to subscribe.