Both games are brilliant!
I love puzzle games, they really make you use your knowledge and understanding of things to pass to the next level. While playing this game, I found myself going to your first game hoping to probably find a hint towards this. And there was none...which I'm actually glad for! As I solved the last puzzles, it brought on the satisfaction of knowing that both games are self-contained and that people don't really have to play the first to understand the second. It's simply there as a courtesy to enjoy the full story.
I found the puzzles in the first one easier to grasp than the second, as well it should be. You don't want the second to be easier than the first. The one puzzle that had me stumped was the Rotate puzzle from this game. It got me pretty good, but then again you do leave hints in all of your puzzles. My issue was that I wasn't exactly picking up on it until I read a comment about what your actually Googling. After seeing that, I hung my head in shame because I HAVE HEARD OF IT! However I know it under another common name. It's not like your hint took away from the name, as it is an abbreviated version you end up seeing. But after finding that out, the other puzzles were a breeze.
Yes, there are instances where all players will have to look something up, but only because it involves different "languages" we either aren't familiar with or have not memorized.
My one issue with both games is that entering the answer sometimes takes multiple tries before it's finally accepted. It has gotten pretty annoying. I would figure out an answer to a puzzle, enter the answer (no spelling errors), and it would not let me advance. And so I would check my answer again and again just to make sure I got it right. It's only till I mash my Enter button on the 4th or 6th try does it register.
I have no idea why this happens. There's nothing wrong with my computer. The Enter key doesn't stick and the answer is always spelled properly. I end up shaking my head when the answer finally takes in the form I've originally submitted it as in the beginning.
As for the secret endings...well I've gotten the one for the first game, but not this one. I know you gave a hint on your page, but I can no longer wrack my brain around it. I'll try it another time when I have an epiphany on it's method.
I honestly can't wait for you to make another one. This is really fun!