Very nice initiative, the language space is overcrowded with commercial offers that have an incentive to keep you locked in. Apart from LanguageTransfer there seem to be few other good offers.

That said, looking at the current offer it seems to lack the one thing Duolingo offers: Duolingo (for all its many faults and pedagogical uselessness) takes the burden of decision making away - I don't need to really think what to do next. Here I don't have this guidance - do I start with basics? Or introduction? Or something else?

Crucial in my view would be to provide a path or at least a tree to guide the user where to go. This will make it easy to jump in and get carried along.