The art is gorgeous! The 3D environment and clean 2D sprites work together. Music fits the atmosphere as well.
I like the combination of cards and top down movement, Cool take on the special object!
However I was confused in the beginning since the first card you pick up isn't focused automatically. I was going through every wall trying to use the door card. I also managed to have a card slot focused where I didn't have a card available. 
it would make sense to me that a card should be focused if you have at least 1.
I had fun with the exploration aspect, I feel like with more cards and level design this could be turned into a very nice bigger game project!