[gjm11]

Closely related (meaning: I think it might be exactly the same game): Antiwordle, https://www.antiwordle.com/ .

[EDITED to add:] Not exactly the same; with Antiwordle the idea is just to last as long as you can, rather than having a limit of 6, and it doesn't have undos. Also, UX-wise, I don't think Antiwordle tells you how many possibilities remain (win for Don't Wordle), and it doesn't have such slow tile-flipping animations (win for Antiwordle).

[meatmanek]

The gameplay is a bit more like antiwordle's hard mode, in that it won't let you play a letter that you've eliminated in a particular column -- e.g. if you guess HELLO and antiwordle tells you you've got one green L and one grey L, you can still play CALLS or ALLOW in antiwordle's easy mode.