Absolutely loving this!! I love the nuance of telling players that you can use just one factory during the tutorial; that had me challenging myself to 1) use only one factory, and 2) never make the same thing twice.
Also had a beautiful epiphany when I realized that after learning to make R by I + (reverse C) + (upside down V), doing D + (upside down V) also works! It means the game is following it's own logic; well done!
(Although I do agree with a poster below, that making T by doing L + (rotated I), and then rotating, should be as valid a solution as rotating the L first.)