I won't describe the changes made in v0.6.0 here; look at the commit messages. The binary was built using PDCurses at commit 2fa0f10dd844da47ee83c05a40a1ec541ceb95e1. Regarding the compiler version, the first line of output from x86_64-w64-mingw32-gcc --version was x86_64-w64-mingw32-gcc (GCC) 10-win32 20210610. I used the compiler available through apt on Ubuntu.