Looking for testers: Sudoku-Battleship combo

[HertogHJ]

Hi,

I've just finished constructing my very first Sudoku. 
If you like hard, colorful Sudoku's with an interesting break-in, this might be up your alley.
I would guess it is of 4/5 star difficulty but it's hard for me to judge so I would like to get some feedback before publishing.

Here is the link:
https://sudokupad.app/b98to2c1k4

p.s. Sorry for the transparent dots, they looked fine in f-puzzles. Does anyone know how to fix those?

[HertogHJ]

I remade the puzzle using SudokuMaker, fixing the issues with the transparent dots. I also shortened (and spell-checked ) the declaration of rules. The puzzle remains the same.

https://sudokupad.app/mt9of0vyhq

edit: I just published the puzzle under the name Renban Battleships, I'm pretty sure it's a five star difficulty.