Bought it without knowing
Critical points for cats
About the cereals: Yes, there are cereals, and quite a lot. Looking at the list in order:
Rice → 2nd ingredient
Maize gluten → 3rd ingredient
Maize → 4th ingredient
This means cereals take the second, third, and fourth spots, even above tuna. The dehydrated tuna is listed at 10%, but the combined cereals probably exceed that percentage. They're not toxic, but they're not ideal either. And it's not mentioned in the description :(