Hello !
What a feedback ! It was touching reading your first experience. It was very constructive.
Regarding the UX / UI, yeah we have to improve it, and we will. We plan to continue working on this game, so definitely we will improve the UX.
I'm glad you liked the art, was a first time for me since I'm more of a dev side usually, and the sound was really fun to made ahaha, this wild card was very fun to do.
Like you I really love playing Plague Inc. and that certainly influenced my choices of UI for this game.