Sheer brilliance!
First of all, I think your Japanese pronunciation is fantastic! The problem with most people's pronunciation in any foreign language is that they strain their voices to attempt to mimic the native pronunciation. You and the others sound like you're laid back. I've been studying Japanese for 8 years now and only now has my pronunciation gotten that great (I think I still have the accent of a Southeast Texas country bumpkin, though! :D ).
Second, I think you're a very serious student of Japanese. You didn't half-ass in your detail, which most so-called "students" of Japanese do (anime fandom has been bastardized because of all these half-assers that claim to know Japanese to any degree of proficiency). You got the words perfect as far as I can tell. Great play on the word "Shiken" as both "exam" and "death test"!
Third, the graphics were outstanding!
Fourth, Great writing overall!
Best regards!