Probably not possible yet but I'll try anyway
1) Is it possible to save tilemap data to either an external file or as an array string that can be loaded in later? I was able to easily create a basic "map editor" but I have no idea if that data could be saved and loaded back in later
2) Randomly creating a world with tiles? I had something basic where it'd spawn a bunch of random blocks around the map which placed a random item/block type. This seemed to work fairly decently, but I'm trying to think of something more robust. Also, preferably something that could be visited again and again (like Minecraft's seed option). This might be related to question 1 though