Thank you for your response! And no, restarting isn't a mechanic used to solve puzzles. The reason why it's explained so late in the game is because ideally this game would last longer than just 6 levels. The idea is that first 4-5 levels are like tutorials, and the actual puzzles would start after that. Unfortunately, our inexperience and the limited time of the jam rendered that impossible, so in the end the game has more tutorial levels than actual levels.