Thanks for the update! The "No rotation" note under the board in puzzle 1 does the job. It's small, but it's right where my eyes were when I tried to turn Tate last time.
I got through 5 and peeked at 6. Puzzle 4 (Out of the rain) is where it jumps for me. Up to 3 you can mostly nudge things into place, but here the shrubs force a long detour, and Yoko starts almost in position, which kept tempting me the wrong way. Puzzle 5 did something similar: one friend starts already ticked, but has to move away first. That was a fun surprise, though it confused me for a minute.
My favourite moment was the umbrella scene after 4. Tate sheltering Yoko was lovely.
Are you planning to bring Tate & Yoko to Steam, or keeping it on itch?