There is a sweet spot that I've found between icon-ifying everything and keeping written instructions in. The mobile versions have a "guiding hand" that also leads through the first level of what exactly to press, but later on, levels like procedures and loops really require a written, accompanying explanation which cannot come across with pictures alone. So, you will see an image that explains the concept as well, but the two together are what works best.

A voiceover/actor would be ideal, but I have yet to search too far in that direction, and would then need those voiceovers translated to the other languages, etc etc.