What needs to be improved..
..is the free choice of minigames. If you can play the "odd-one-out" game 23740 times in a row and mermorise the symbols, getting a 100% score in a small amount of time, the games not hard to beat. Mixed challenges would always be a better solution in my opinion, because then you are at least "challenged".
And I advise to make more figures per level in a sequel, because they all repeat like hell (always the same 10 ?)
another thing - the euro game is harder than the weight game, and the score is the same. i mean, uniform black wieghts with white numbers are obviously better to differentiate than a current lots of newgrounders have never seen. still the money has different forms and colours, what makes it difficult to calculate, for me at least.