One of the main things I'd like to see added is some sort or reroll or ban option when getting enough XP to choose a new card
1 hidden mechanic that I didn't know how to explain in-game is that if you skip a card it will reduce the amount of xp needed for the next level, so you can kinda force some build, maybe this will help.
Adding some kind of reroll items is also a good idea:
- reroll cards
- reroll next stage options
- reroll relic rewards / shop