This is great, thank you for playing! We are definitely looking to scale up the difficulty in the full game. We hope to strike a nice balance between difficult and relaxing, and may use the challenges and bonuses to assist with that. We are going to try keep those in world puzzles consistent throughout the game to help keep the levels unique, as that's some of our favourite levels to make!
Thanks a bunch again for playing and we will looking into applying some of your suggestions in the future!