Agree on the timer.

In one sense I really enjoy the timer up to the point that I lose, but it feels very unsatisfactory, especially if I lose early, & I'm acutely aware the difficulty level it's set at will be experienced radically differently by different players (to the exclusion of most I would imagine).

Having a timerless mode is very much needed as an option - there's no real risk of "cheating" with these cookie-based browser games anyway since I could just have infinite retries in a private tab if I felt like doing that.