This file is for keep track of features I want to implement after we have optained a minimum viable product.
* Published vs. Unpublished levels. A user who is still creating a level probably would not want people playing it while it is still in production
* Anyone can edit any level, but the edited level is now saved under a new name
* Users can create playlists of levels
* Creators can create campaigns: series of levels which must be completed in order
* Store info on playthroughs
* Determine level difficulty based on attempts at a level vs. completions
* Track who finishes fastest and with the fewest girders
* Play against ghosts of previous plays
* Social sharing
* Data viz for each level / user