So, I love Lingvist. It is awesome.
I like it's repetition patterns, etc. I'm rapidly approaching 5000 words in French: for me, at least, that really means I barely know many of them. And I remember them largely in context of the specific sentences they show up in.
I think it's probably helpful to learners to have the same word pop up in the same sentence the first bunch of times. But eventually, it might be helpful for it to show up in other sentences as well, possibly with some of it's other meanings/uses.
Now, it may be that LV sort of does some of this: I imagine I see it sometimes when words I'm working on show up in other words' test sentences. That's cool too.
Anyway, just suggesting another layer, if you ever get to it.
Thanks for a great program!!!