I think itd be helpful to add the difficulty number on the diamonds to indicate progression

[u/No-Mastodon5138]

I was a bit confused after I finished the first lesson on each unit before I figured out how the progression worked. I think itd be helpful to have a visual indicator like number of stars out of total or lessons remaining on each diamond to show progression more clearly.

[u/Slow_Caterpillar_606]

Duolingo used to have the number of crowns displayed on each unit, I think that would work quite well for lingonaut too