I'm a Marine Biologist!
I very nice little game!!
I really enjoyed it. The music was very peaceful, and the graphics were simple, but very pleasing.
I especially loved the simple little characters riding the train, and giving your end score/profession.
My only complaint is the very first game.
It would give me X ? 3 = 6
Now, this is technically just a guessing game. I can either say the ? will be multiply, assuming that the X is a 2. But it will tell me I was wrong, because the real answer was that the ? was addition, because the X equalled 3.
This makes the first puzzle half about luck, which defeats the purpose of brain training. So I'm going to have to dock you points there.
Other than the first puzzle, it was all very nice. Good work :)