Yes, yes, yes, Wonderlanders!
Adding the letter to the end of the level name is a good idea, and I did start doing that on the next levels.
With three other Alphabet levels on the go at once, I quickly realized the confusion

that would follow if I didn't change it. Starting from now on, you will see the letter at the end of the file name. And thanks to all who suggested it.
As you will see, I'm not uploading them in alphabetical order, they arrive in my head in no particular order, so I upload them when they are done.
Glad every one likes the idea! Just hope I don't run out of ideas before I run out of letters.
