Thank you for your feedback!
Indeed, we had a few easy ones and some really hard ones but nothing really in between. It requires also a lot of play testing to balance out the different puzzles. So like you said we didn't have enough time to make that right :)
It's indeed a good idea to make the goals a different color for the different worlds.
By the way, the game's main idea is that you are controlling only 1 monk who's traveling through different dimensions (planes of existence) at the same time :)