The material is really good and lesson sequences are really well thought out. I'm a visual person, so the visual demonstrations of what is going on behind the scenes are really useful for me.
Suggestion: I'm quite forgetful. I've recently found out that "Spaced Repetition" helps me immensely to retain, retrieve, memorize important things. Therefore, I think it would extremely valuable if you could offer Anki cards as part of the course material.