This is such a great concept! If you can solve just a few things you can go a long way with it:
1. looking up cards breaks the flow because you need to click and scroll. It also makes sense add filters by cover and sort them, but i wouldn't say those solve the main problem. May be you can just use the rest of the screen (top right) to show which cards are there, pre-filtered by the cover? although if you make it too simple game will feel boring
2. sometimes there are streaks of increasing cards and you can't get anything from correctly guessing them. I am less sure if this one is actually a problem, but it feels to me that you need some reward
3. you gain too much cards and it slows down the pace as well as just make things more confusing because of no sorting
4. music is repetitive, but i guess it's a jam thing
And i must say I absolutely adore the idea of letting the player to figure out that they can use different covers to their advantage to identify (but usually still not be sure) which card is next!