Since PowerApps does not have source code text files, it would be extremely helpful to simply have an export feature that would send the basic properties and actions of your app to a text file in JSON format or similar. I would use this to quickly use text comparison tools to check what was changed in a version and to search changes to actions or properties. I could also fully describe the 'versions' of my changes in Git or some other source control. Mainly it would be used to help ensure I didn't make some silly change to the application that was unintended. Please, please, pretty please add this feature.
What I am thinking would simply be a JSON representation of the application settings (below is a rough idea):