It's a clone of Wordle. There is a single correct answer per day, and everybody gets the same puzzle. There will be a new answer tomorrow. So, since the puzzle

It's a clone of Wordle. There is a single correct answer per day, and everybody gets the same puzzle. There will be a new answer tomorrow. So, since the puzzle will be the same, there isn't a huge amount of reason to let you reset. The page could have made that clearer. (Wordle says it when you open it the first time, and also under the help menu.) I double-checked this by looking at the sourcecode.