Funny :) but I think it would work better if the language not only required Nynorsk, but used Nynorsk and not Bokmål for all keywords:

https://ordbokene.no/nob/nn/ellers

I think I also saw "ikke" in there.

And https://ordbokene.no/nob/nn/endreleg isn't a word in any language? The Nynorsk word for it is sadly just "variabel". To make it more interesting, you could require agreement, and instead of "endreleg fart", how about just using the indefinite article for things that are changeable since things that are changeable seem kind of indefinite:

    ei fart = 70
    eit smell = "bang"
    eit fag = "naturfag"
    ein slutt = "."

And of course

    forKvar fart
    forKvar slutt

but

    forKvart smell
    forKvart fag

And if you mess up the agreement you get a red squiggly line, and for every such your grade goes down from 6 and if it's less than 2 your program fails.