Echoing what others have said, this may be a very rough first draft, but it's got the makings of a fantastic game. (Please don't abandon it, this is one to keep polishing.)
The fusion of a deckbuilder with a shape-packing mechanic is a great twist, and the way that some cards leave items on the grid that can interact with each other has a TON of potential that reminds me a little bit of Backpack Hero. I'd love to see more of that as things develop.