I think Danish is one of the easiest languages out there! The only difficult thing about Danish is the pronunciation, but even this is easy once you get the hang of it! Danish has hardly any grammar. You can't compare Danish with the Slavic languages, Finnish, Hungarian or many others!
I agree. Danish grammar is probably about as easy as it gets. I found the pronunciation seemed extremely daunting at first, but now it's a lot easier for me. The part of Danish that I struggle most with is knowing which prepositions to use with which nouns in what situations - it seems that they use different prepositions for different rooms of the house!
Can the natives please comment on the pronunciation of 'leve'? Duolingo pronounces it the same way as words such as 'blev' and 'skrev', but according to Den Danske Ordbog such a pronunciation is not admitted. And the official pronunciation is the one I remember people singing on birthdays ("Hun skal leve! Hun skal leve!").
Yes, I think it makes sense, with a normal shift in language. Personally I would use the Duo pronunciation except when singing "hun skal leve" as in your example, but I think it is normal to enunciate more when singing.
My pronunciation might also be regional, as I am from Jutland.