Hi Cro. I recently purchased the game after trying, and getting addicted to, the lite version. I'm what you would call a "hardcore gamer". Along with competitive console games, I play both Magic the Gathering and Yu-Gi-Oh professionally. After 2 days of off-and-on play, I've made it to the 7th level.
Thus far, the only things that I've seen or think the game needs are:
-Alternate ways to earn gold.
-Deck editing legend. (number of cards, card ratios)
-Multiple deck slots.
-Hand number for both players.
-A date and brief overview for upcoming updates on the title screen.
-Multiplayer (further on after more updates)
With that said, the only two things I saw that needed an actual fix were the "no card playing" glitch, and not being able to purchase alot of the enemy's cards.
I've been having a blast with this game and can't wait for more updates to be released. It would be another thing to look forward to. (hence the "update date" implementation idea)
Oh and one thing I hope doesn't get fixed... I don't know if you realized it, but you can have an unlimited amount of upgraded minions.
I currently use a red elf draw engine in every deck, consisting of a lot of 2nd level elves (Druid Oakmage), with the max of 3 1st levels.
Thank you for your time, and for the record, you're sitting on a gold mine with this one...trust me.