Hey, I just played the game and really enjoyed it. Very relaxing. Except for 2-3 minor things:
1 - The block colors sometimes clash with the background or eachother
2 - Especially with that many different colors everywhere the permanents scrolling up and down for new pieces can be a bit nauseating.
3 - I liked the moon. And space. But the rocket and UFO kinda distracted from the relaxing aspect due to how loud they were...