This is what a jam game should be: trying new ideas and combining them with proven ones in unexpected ways to see what works. I could almost feel you learning. Mastermind is one of my all-time favourite games so I was disappointed that it wasn't fully realized here. In Mastermind, the hacker gets feedback about their guess as a whole (3 correct, 2 incorrect) not about the individual elements (right, wrong, wrong, right, right) as in your game. The fun of it is in the reasoning process where yours is just trial and error and memorization. The Whack-a-Mole weed clicking part of your game is excellent, though, as is the overall feel.