Excellent job! I was a young boy when I played this on Windows 3.1, and you've just brought back so many memories!
I actually came across your remake because I recently started developing my own Bang! Bang!-inspired video game. I'm developing it in C++ with SFML, and I'm not expecting to match your level of quality or fidelity to the original. It's just a little project for fun.
I just wanted to congratulate you on your fantastic work!