Thank you for your feedback !
For the clock counting down, I think it would go against the initial idea that is to make something as chill as possible. I saw a few streamers play the game and they ended up with very different times. We prefered to give a timer in the case where the player wants to speedrun the level, without forcing everyone to rush through the game.
The achievement system is a really good idea ! It would be possible to give funky challenges that you can try at your own pace. I love this idea !