Good concept!
I was rweally enjoying this game at first, but as I progressed up through The Mentals I slowly realized that the games were always going to be the same. Fair enough, they were slowly getting harder, but playing the same four games over and over again quickly gets tiring and a little boring.
A big flaw that actually made the game HARDER for me when it shouldn't have was the inclusion of Euros as the notes/coins to use for the counting game. Using any kind of of real note that a lot of people aren't going to be familiar with is going to make it harder. I think it would have been better if you used a generic made up currency for all the money.
I liked the music for this, it was very reminiscient of Dr Kawashima on the DS, a game this has obviously been inspired by. If a sequel gets made, and I hope one does, it would be good to take another cue from Dr Kawashima and add even more minigames, thus adding more variety and increasing replayability.
It's obvious that a lot of time has went into making this game, and the characters, and I look forward to more int he future.