This is really fun take on low level beginner programming! This feels weird to say about a programming game, but I really liked the graphics. They're easy on the eyes and simple to understand, great job on the UI design overall!
There's quite a jump in difficulty in the current levels from the Squares puzzle to FizzBuzz in my opinion. I was unfortunately unable to complete it due to a bug with the Jump-If-card causing the simulation to fail immediately whenever the condition wasn't satisfied and the else jump should be used. In general it would be very handy to be able to access the simulation log afterwards to look what exactly went wrong.
But like I said, besides these minor issues, the game is in a great state! With these issues resolved, I'm actually looking forward to the extra levels you teased in the description :D