To people stuck on the second puzzle look at the screen when you screw up then look at the hint and make a word that means what they suggest. For the 3rd puzzle (which is numbered 2 oddly) you send us to a voice recording service, i am guessing we are supposed to hear some message but there is nothing on that page. First, don't send people to some outside page, we don't like that, especially when it is some tiny ad filled site we have never heard of. Please record something upload it to newgrounds and link it in on newgrounds. If it is not a message to be heard I don't get your hint you have 4 sets of 8 spaces each. Vocaroo has only 2 8 character words on the page comments and improved neither of which seems to be a password. I also tried other words/word sets from the site and nothing works. Consider adding a hint system.
Yes, I have heard of binary, but without you mentioning that it wouldn't have been something I would have checked. With that and the correct audio file I have passed that level. Also got past the next one (chemistry) no problem. I am not fond of cyphers so I think I will give the rest a pass for right now. There is definitely some fun to be had in this game, and I am going to update to a better score it is obvious you did put a lot of time and effort into this, Without updating the game you may want to make a list of hints (where applicable and post them in the description or somewhere to allow people who want to keep going to do so. Good job though!