Stumbled upon this game thanks to a reddit post and oh my goodness this was such a wonderful game! I ended up solving pretty much everything on puzzle 9, except for the bottom right corner hints (which I completely forgot about for a few puzzles) and the backwards final solutions (which I worked out on question 8). Everything else went very smoothly, with some fun "aha!" moments thrown in there thanks to puzzle 11. The only part I felt was a little tough was Puzzle 1 having the required first letter L be in the top right corner - none of the puzzles have hidden letters in the remainders (except for 12 but thats part of its puzzle) so it feels a smidge illogical. I could have easily missed an alternative solution though.
Overall such a wonderful gem of a puzzler, thank you for creating it :)