I like the idea a lot. I don't expect a lot of feedback/reviews from other scientists, there are just not that many and they are likely busy with something else
JOSS has a review process like this, but I don’t think I’ve heard of any journals focused on primary scientific results using this kind of GitHub based review process
https://joss.readthedocs.io/en/latest/submitting.html#the-re...
I wonder if it could also get people to sponsor replication studies, and publish them linked alongside.