I wonder if they fixed it, or if it depends on the game type. In Versus mode, I got 10/10, Jev got 7/10, but the points were closer: 1201 to 1034 so I assume time is also part of the calculation. One of mine was 9.6 seconds vs 0.3 seconds. It wasn't always clear where you were supposed to click, like on a graph, the choices were buttons at the bottom of the screen.
Its a combination of time and correct/wrong answer. But the game had not been played by these many people before so it can be that the scoring mechanism is not fully calibrated. Thanks for trying it out!