This looks great! I've always liked the result of 3D mixed with pixel art! And it's good to see another dutch game maker that's good at pixeling! Keep it up! Oh and I suggest you implement all the extra features before you translate it, so that the dutch people also get the full game
I love the concept of it being used for education Not so into the 3D, but I'm sure it turns out better in the game than in screenshots.
Disclaimer: Any sarcasm in my posts will not be mentioned as that would ruin the purpose. It is assumed that the reader is intelligent enough to tell the difference between what is sarcasm and what is not.