First of all, this is an interesting take on survival games. If the allies can eventually be set up to do basic tasks when assigned instead of just attacking what you hit, I can even see RTS elements, which is something I've wanted in a survival game for a long time. I look forward to seeing what you do with it.
The card game is also an interesting concept, but either the mechanics or the explanation need a bit of work. Maybe both? It took me a bit to figure out how to read the cards, and even now I'm guessing. As for the cards themselves, I am usually discarding cards as I either can't use them on my partner, or they focus on getting one side off, making it hard to bring both characters to climax.
I'm sure you are already aware of some bugs and plan on fixing them, so I will only briefly list the ones I ran across, in case I ran into anything new. 1) Can't use E to interact with anything in fullscreen. 2) Some of the hit boxes for picking up items need to be adjusted. I end up mashing E to pick up one thing. 3) My ax couldn't do damage to enemy foxes. Had to rely on my partner to fight. 4) I couldn't select quit game when I died, via mouse or keyboard.
I hope my criticisms aren't seen as disliking the game. I am well aware it is a work in progress, but I have high hopes for it.