I created a workflow that helps add newly discovered vintage tile sets:

1. download
2. merge
3. quick de-dupe
4. slow de-dupe

This means there are now 29 extra tile sets for a new total of 349.

I also took the opportunity to correct some names of existing tile sets.

The next version of the game will save the name of the tile set you have selected so that it maintains the selection even when the quantity of available tile sets change.