I compared your feed (chick meal) with mine (watervogelkorrel/waterfowl pellet)
Chick meal Waterfowl pellet
Crude protein 19,4% 15,4%
Crude fat 4,0% 5,5%
Crude ash 6,0% 7,3%
Crude fiber 5,0% 7,0%
Calcium 0,90% 1,25%
Phosphor 0,56% 0,65%
Natrium 0,18% 0,14%
Lysine 1,00% 0,68%
Methionin 0,47% 0,42%
I don't think it's really unhealthy, the protein is higher because your feed is for baby chicks. Kinda weird to see Dutch on your package. Sadly the brand I feed can't be ordered online, and most webshops don't ship worldwide, only within Europe.
By the way, your duck is super cute!