So I played this game but there was a problem. I know nothing about Black Jack. And this game isn't beginner friendly to people who have no idea about Black Jack!
But I have a bunch of things to say even though I wasn't really able to enjoy the game in its fullest. The game feels a lot like the GB Pokémon games, both in battle and in the overworld, which I love! I also really like the art and the sound! It also seems to have a good bunch of content, which, again, I couldn't really experience because I couldn't go too far, but it already gave me the idea only by playing it for a bit!
All in all, it's a really nice experience! Great job. :)