Fun game. The concept is good. However:

I couldn't find the go button for a while...finally realized it was part of the keyboard...that could be better

I don't get the colors on the keys, as intuitively it seems like it should be the available letters in the current position, but they don't change based on the letter spot I would be currently typing in.

I wanted to share my result with a friend who loves word games, but there was no share button. Also pasting the link does not come up with a web preview in slack/messengers.

It would be nice to be able to go back and play past days.

In terms of difficulty,hard but achievable. Might think on a difficulty slider, or a climb (first solve 5 letter, if won, 6, then 7?