Phisto Fortress II: Blobz sets up a tower defence Sudoku for us to take down

Today's Video:

As usual, amazing puzzles from Blobz with a very smooth puzzle for a 2* rated one!

Link to Play:

Phisto Fortress II by Blobz https://sudokupad.app/blobz/phisto-fortress-ii

Rules:

Normal sudoku rules apply.

Digits in fortress cells are SMALLER than all digits in orthogonally adjacent non-fortress cells.

Along a green line, adjacent digits differ by at least 5.

The grid is partially covered by fog. Placing a correct digit will clear surrounding fog, possibly revealing more clues.