Logic Masters Deutschland e.V.

I came up with these rules while experimenting with the basic idea of Yin-Yang puzzles. I designed them independently, although I strongly suspect that something similar — or perhaps even exactly the same thing — already exists somewhere in the puzzle world!
So I decided to create a puzzle with these rules and share it here to see what experienced solvers think of the concept.
I would be very interested in any feedback, both on the rules themselves and on the puzzle. I also have absolutely no idea how difficult this puzzle should be rated. I hope it isn't completely trivial, at least!
Thanks for giving it a try, and I hope you enjoy it.

Rules :
* Divide the grid into two regions.
* All cells in each region must be connected horizontally or vertically.
* No 2×2 area may be entirely contained in the same region.
* Each Mikata clue shows how many cells in its surrounding 3×3 area belong to the same region as the clue itself.
* The clue cell is included in the count, and cells outside the grid are ignored.
* The colour of a Mikata clue is not given. You must determine which region it belongs to.
* The two regions may have different sizes.
* The two colours are interchangeable.


Play here