I've chosen a system called PlayFab to handle all the score keeping and leaderboards. I've started implementing it, and currently the game will submit your score. Unfortunately you can't see it, and your placement on the leaderboard. Yet.
This means that playing the game will now submit your Steam ID to Microsoft's PlayFab service, along with your score. In the future it will be possible to revoke this data from within the game, and it will also become an opt-in feature in the first place. This data will not be shared with anyone.
I've also done some work on the aesthetics, so level 1 will have patches of grass now and the rocks are now always grey. There's a lot to be done still.