Some thoughts: I liked the 'Challenge' mode, I think it gives some novelty to card games :) But I think you could improve it by not making all the challenges available upfront, but instead making them something the player has to unlock. I have played the first 5 challenges, and then explored the others a bit. Genuine question: is the Dragon Slayer Legend beatable? I could not see a way to deal damage to it, as my cards' attacks were always lower than the enemy's defence.
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Thanks a lot for pushing through the challenges! Glad you enjoyed the Challenge mode concept! For the unlocks: You're totally right. Currently, I left everything unlocked for quick feedback, but a proper progression system is definitely planned. Besides, I know this type of game relies heavily on precise numerical tuning and specific mechanics interactions and thats also in my todo list for future iterations.
Thanks for playing so deep into the game, this feedback helps a ton!