Right from the get-go, the game looks nice. The music is pretty, the menu is nice, the logo looks great, background environment looks pleasing. Real good.
The in-game UI looks great. Very clean and readable. The older I get the more trouble I have parsing game UIs, and I don't know if it's just because I'm old or if games these days just tend to have really dense, awful UIs, so it's nice to see one that I can understand at a glance.
I'm not really familiar with card games outside of oldschool Yu-Gi-Oh, so the battle interface took me a second to grasp, but it's pretty intuitive overall. The animations, sound effects, card art and everything else are all nice and fit well. Opening card packs is really satisfying. I don't have any complaints. It's very fun and feels intuitive enough for someone with only a little card battler experience to pick up and get going very quickly.