There isn't that much contrast between the green and yellow or the blue and purple, so it would be difficult for low vision players to know which guesses are correct. There are different types and severity of colorblindness, so colorblind mode should have some visual cue other than color.
One suggestion would be to put a tiny check mark for correct letter with correct placement, an exclamation mark for a correct letter with incorrect placement, and an X for incorrect guesses, in the corner of each tile.
The original wordle had this problem too. I emailed them but they didn't haven't fixed it yet.
Other than that, love the game! It's a great variation.