Hi! Thank you, I'm happy you enjoyed the demo! <3
Hehe, no worries, your English is great!
As for your question, the food and drink choices will already be set by the game. The only choice the player can make regarding that is choosing to be vegetarian, vegan or not >_<
Regarding the art style, if you mean the food art then that's absolutely the same art style as the food art in WWCG. Food art that I commissioned from my friend Florisam <3
If you mean the sprites, the artist who made the sprites in Killer Trait is actually different from the one who made the sprite in Where Winter Crows Go. All of them are wonderful stock sprites but still from different artists, hehe.
Thank you again for playing <3