Fantastic idea and implementation for a game! I love the science/educational aspect of it. It's like you're exploring a game world (most games are like this), except it's based on real physics and chemistry, so you're really exploring the *real* world.
I've played other science based games, but this one is *by far* the best. Honestly, that's all I have to say in terms of a 'review'. Good game. Good science. Play it! :-)
To the creators:
There are a couple of minor game aspects which did annoy me, though. First, if you try the challenge levels immediately (say the Atoms challenge levels), it brings you off the 'tutorial' path, and you can end up missing a lot of the tutorial info about the game mechanics, and also places the science 'lessons' in the wrong order. I would recommend that on the player's first play-through you don't offer the challenge levels in between sections, but instead have them 'unlocked' after the player finishes the main levels. Many games operate this way, and in this particular game it would keep things in a better order for the player.
Second, I can't find a way to get back to the 'learn more' text for a particular completed level aside from re-playing the level again. I think you should make it *really* easy for people to get back to those notes without having to go through the level again. That's kinda the whole point of the game, IMO, which is to 'unlock' or discover/collect these great nuggets of information. Perhaps you could even have them all collected into one interface, like adding notes into a notebook which you can go back and review at any time in the future.
Whoever was in charge of deciding to try making this game: Really great idea! Please make more games like this, or at least spread the word to other science organizations that this is a fantastic way to educate the public about your work, and science in general. I really think this is a hugely rich vein of possibilities for great and innovative games, and the more people understand and appreciate real science, the better off our whole world will be, IMHO. Thanks so much for this game. Everyone involved did an excellent job!