I don't see any mistakes. Mirko played strong all the way through.
Maybe my 7.p14 was a little weak to the south. It gave Mirko space across the bottom, which he used later with 14.l21. I thought my 15.l19 move would work, but maybe it really doesn't. Maybe 15.n19 would have worked.
19.j18 20.m19 21.j16 22.i20 23.i21 24.h18 25.h17 26.j22 27.g19
would give a win for White but even with 19.j18 there is
19.j18 20.m19 21.j16 22.i20 23.i21 24.h18 25.h17 26.h21
which seems to be a win for Black.
Maybe my 7.p14 was a little weak to the south. It gave Mirko space across the bottom, which he used later with 14.l21. I thought my 15.l19 move would work, but maybe it really doesn't. Maybe 15.n19 would have worked.