I also love the countdown. Counterintuitively it makes the game less stressful — the counter goes back to 30 no matter what. If the timer counted up, you'd constantly need to care about getting each one as fast as possible, or fret about one that's taking you minutes, etc.

With the countdown, you more want to care about the high level stuff: Keep your brain agile enough to get the next one, figure out more general patterns, ensure you "cover" the promising patterns, notice tough spots (with tons of patterns) where you you'll need to lock in. That stuff is more fun to focus on than speed.

Everyone wants to fail less, sure. It's not surprising people's feedback focuses on the mechanic that made you fail! That doesn't mean changing that bit will make the game more fun.