It's possible to reach 100% by collecting all the stars. I don't have any plans to make part two for katkoot at the moment but I will definitely make another game with more insane puzzles some time in the future.
edit: also katkoot was indirectly a sequel to CYFTG (can you finish the game?) hence why you saw the (2) at the beginning. It's a mobile game I made years ago. You might give it a try if you are interested.