We had 99 participants... Damn, so close to 100! :) Anyway, the minimum of 60 was easily achieved.
This means my work is over... Which is not the case for my partner in crime Laura: The experiment was part of her master thesis, and she's currently processing all the data and writing the paper. Since all the data is looking good, "mission succesful" is the right thing to say.
Now the experiment is over, it's no longer possible to submit the survey or your highscore. I removed the download from moddb to prevent people from trying to fill in the survey in vain. But in a couple of days/weeks, I'll have a version of the game online with all the survey stuff stripped out.
Again, thanks to all the people who played and/or told others about the game!