I don’t see this listed in the tags or description, so I am going to put it in a comment, but levels become timed challenges after the tutorial section.
The time was quite generous at first and I never really struggled, but I prefer casual, no pressure puzzles, so I put this one down before I progressed much because I could tell it wasn’t going to be my cup of tea. I didn’t touch endless mode in Raide, for instance. If timed challenges are a dealbreaker for you like they are for me, this might not be your game.