finished it right now, with no actual problems with every level but the 9/10 one. English not being my native language, i didn't understand at first what red herring and smugness stood for. Furthermore, i had missed a little point in my logic and it took me a while to finally notice it.
The 10/10 one made me collapse at the very start, but it was ridiculousy easy as soon i had it written down in the same manner as the other levels.
The ending, well, it left me really disappointed and dropped a bit of the admiration i had gained for this flash. I won't spoiler anything, but what i mean is that it's not the ending itself to be disappointing, but the explanation for it. I have read the final dialogue thoroughly a couple of times now, but that "rational potential realisation rate" is still bugging me. All the theories were proven, and the demonstration of an average logical intelligence in the subject was seemingly the aim of the tests. Then, why that counterpoint at the end? You aren't really never given the opportunity to raise that score, so what was the point of all the test?
I really hope you'll answer this, or point out to some kind of an answer to all players in general, because i feel like either i'm missing some important points, or this game is rushed towards the end.
Anyway, you deserved a 5 by sure.