If someone plays past the first few levels, you can be quite sure he/she is not afraid of some explanation about how stuff actually works, and having that would have made the game a lot more fun for me.
Also, in the Sagnac-Michelson-Morley level, you're supposed to place a "Sagnac-interfRerometer" somewhere (hint: it's the vacuum jar, and that's a different thing). ;)
For experimental stuff, it’s crucial to show first, explain later - if at all (otherwise you are killing the sense of suspension and awe):
The researchers’ conclusion was that, in the context of strange toys of unknown function, prior explanation does, indeed, inhibit exploration and discovery. - from http://www.economist.com/node/18741484 (When should you teach children, and when should you let them explore? - The Economist )
At the same time, yes, I agree it would benefit for adding some explanations, descriptions or links later. Just... many project, little time. But thanks for bringing it up!