In my personal opinion, I really like the puzzle. It was easy for me to figure out the first try probably because I love puzzles. I saw that you planned to add hints in advance for the puzzle. While I think it would be a great idea, I do wish it would be an optional thing where people can choose to get the said hints or not if there would be more puzzles in the future. I like puzzles, but I also want to enjoy the puzzles without feeling they're too easy due to the hints or too hard due to no hints.
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This is the last kind of feedback I thought I'd get! It's too easy, you brainiac?! :D Okay, thank you, that's noted. Not too easy and not too hard is a balancing act, but guess I'll just do my best with it. I probably won't add hints in advance, but maybe I'll add a comment from coach saying that "if you can't find it, I'm sure someone will help you with it". That way, the player gets a hint that it's a challenging puzzle, and that help will be coming if you need it :)