Wow, you added a lot more levels to Retrofuture since I last played it!
Really cool how it remembers which levels I've completed, even when I close the browser (except private browsing). Is the player's progress being stored in a cookie?
Yeah, this is the full release that I put up on Google Play.
I'm writing player data to Application.persistentDataPath using JSON (which on web is stored in one of the types of local browser storage HTML5 introduced). Usually I use PlayerPrefs, but I decided to write something a little more flexible this time. If you want, I can go over it at the next gamedev meeting.