This game feels like it has a huge scope. I did enjoy the idea of combining a cardgame with real time elements. Maybe cards that aren't buildings could increase the fun of playing cards into your kingdom (like a band of archers or a huge boulder crushing enemies xD). Overall this feels like a very solid base to build upon. Content, ballancing and polish can make this game a hit! If you look at other digital cardgames they put so much effort in polishing the "card-interactions".  here are a couple of notes:

• Your cards cost should be visible at all times
• scale up the cards
• try toning down the move and scale of the cards you mouse over
• It looks like you distribute the handcards evenly over a fixed distance. propably a layoutgroup? try using a gridlayout group with a fixed distance between cards and a central alignment. That would feel much more like i was holding cards
• add (very slight) Screenshake when playing a card
• most of your cards movement is already there. From your center to your deck (bottom right corner) but then the movement into your hand is missing.

sorry for rambling so much. Digital cardgames are my passion! I hope i didn't offend you or anything. What you did in a week is incredibly amazing and i could only dream of accomplishing something like that!

Love the idea, not sure how it matches the theme ? 
Took me a bit to understand how to make money as I did not read the description before ^^" 
but will bookmark it for later inspiration ;) 
Add more enemies and make it a city builder / vampire survivor / roguelike deckbuilder