My only feedback is just that the homepage had a lot of elements that distracted me initially - I wasn't sure if I had to type something (the input examples changing all the time made me think it was important to fill it out)

I ended up clicking "Start Game" on a whim and was glad that I could check it out immediately. Maybe make the "I just want to play now" option/button/CTA larger/more obvious (i.e. giving it more focus)?

To test it again, I just typed some words in the input bar, it forced me to login, I chose the Google login, I was then brought back to https://endless-wordsearch.com/#/sso-callback but the top right button still says Sign In, and my input was lost. So I assume the login didn't work?

I typed my input again, a popup appeared (mentioning Clerk)... then it finally logged me in. Now I'm back at the homepage, and my input has been lost again :-)

I typed my input a third type, and now I'm getting "Generation failed".

The drag to pan, hold-then-drag to mark felt really clumsy with a mouse. The hold delay is just too long. Maybe consider drag-with-left-button to mark, click/drag-with-right button to pan.

The word list seems odd, half the words I tried were rejected. You don't need many failures to accept a reasonable word to lose faith in the game. Is the idea that only the words at the bottom are in the dictionary? Doesn't feel like it can be, given it only shows about 20 words, is not scrollable in any way I can see, and many words not shown in that list were actually accepted.

- the long press feels a little bit too long on mobile. At least I think it is? I thought nothing had happened because my thumb was covering the active state of the letter that I pressed down on. Potentially a combo of the two

- you can "cheat" by moving the board and tracking when your word disappears

I'll see if I can repro.