Which tiles don't match up? I have used aseprite for the preview images!
It's the beach scene, and a few.
The square on top of the beech seems to only fit once.
The curves also don't seem to fit right.
It may just be me, but I can show you a screenshot if it would help.
I checked and you were right indeed, there were some beach-grass tiles missing, damn! Any more to report? I've just updated the .zip and thank you, btw! :)