Really nice game!
I like that you show the rarity of the cards, that's the first thing I noticed in the game and it felt so good to have, yet it's just a simple thing to add. It let's you think like "Well, I got this uncommon choice, it will not happen often, I should start with this". And so I did :-)
Nice art, relaxing colours and UI.
At first I didn't understand I could destroy with the mouse click as well, I was just enjoying the bouncing ad rolling of the axe, then I notice the Clickaxe icon and I found out later you can upgrade those. Nice!
Finally, one of the first things I thought is that it had the same mechanics as puzzle games like Tetris or Puzzle Bubble. That's when I started to click to see if I could break a block and it worked. Well, the death on unbroken blocks is not there, but I think that you should add it, at least as game option. That would justify more for me the challenge of the game, that at the moment I don't see. Yes there is the challenge of unlocking things, but for me the real fun and challenge would be to don't leave blocks passing the top part of the screen. Try to put this option and play with that and let me know what you think about it.
The game has lots of upgrades and it looks already like a product that is nearly ready to be shipped.I am sure you have a nice game on your hands, you just need to polish and add a few options and you are done!
Congratulations guys! :-)