Great educational game, I might even learn a thing or two :D There should be more stuff like this out there.
The game is quite great as it is, but there's one thing that bugs me. The music. Its GREAT! So where's the problem? It doesnt play always, in fact, almost never. I thought this had no music after all even though there's an option, but after several days of playing it suddenly started, now its not playing anymore again and I have no idea why, I tried setting on/off, clear cache etc but Im at the end with my Latin, so if you could fix that that would be great. Oh and while at it, maybe add more music? You got a great taste there.
Also, it does take quite a while in the later levels to get enought atoms to proceed. Not exactly a critique, more of an observation.