I like knowing the time but I don't like being cut off by it. Just let it count up. Same with the moves. You can say what "par" is to make a goal to achieve, but let people take as long and as many moves as they want. They will pressure themselves to do better.

Within 60 seconds and while distracted I managed to figure out how it worked and win my first round (also clicked right through the text) - but then I failed the second round by running out of moves, so the first may have been a fluke :)

I think the timer can help avoid people who will over-analyze colors, but it definitely also changes the way our brains allow us to play - maybe a compromise could be a "free-play" option with no timer, but keep the timer by default? Or the opposite with the timer as a "challenge" mode? I could see the interest in both- it would be neat to see how few moves I could complete a puzzle in if given infinite time!

Also replying to another comment, I do think it is the right choice to allow multiple plays (you may have changed that in the past 10 minutes since it seems I was able to play twice)

I actually liked that it had both a timer and move limit - helps prevent analysis paralysis. My biggest complaint was that the blue and purple colours seemed very similar.

I'd probably bump it to 90s, at minimum. I moved what I felt was pretty fast through it, and ended up in the high 50s both tries (1 fail while figuring it out, then succeed).

After your first loss it starts counting up while the 3...2...1 go thing appears, which costs you three seconds.