True, we were more inspired by the limitation of 'color palette' (not only on the visuals, but also on the mechanics) than the theme of 'another world'.
I can agree with some levels being very easy at the begging. We've seen some players do them at random and later get stuck at the more difficult levels because they didn't understand how the game worked. Finding a right difficulty progression is something we definitely need to work on.
I really appreciate the honest feedback, it helps us improve a ton!