Maybe I'm dense but I don't see how to get Castle cards in order to build the castle. I searched the forums and others seem to have been able to get to Castle level 3 or 4, so it must be possible :D But how?

Why should we be tasked with remembering all the cards we have in the deck? Why can't we inspect the deck to see everything in it? Memory is not a fun mechanic. I say let us see what's in the deck.

i just downloaded the game, been playing the demo for awhile. i can't seem to make any progress on the full game past a few draws. is there an issue?

I have a Graveyard and when I build something next to it, nothing happens. According to the Graveyard card I am supposed to be able to discard up to 6 cards from my hand. I deleted the Cathedral that I used to get the Graveyard cards. (Cathedral seemed useless after being built and consumes 2 spaces.) Is this perhaps why? If so the card should probably note this....

There isn't much motivation to play the challenge mode right now. To make it more appealing, I'd like you to consider creating achievements based on this game mode. Casual mode is a nice game mode but the endgame and castle hunting are very grindy. Overall, I think the game needs more motivation for grinding and achievements are the solution to the greatest extent....