I like the graphics, animations and music a lot. I cant seem to get a hang of the gameplay yet though. I dont know if I lose or win and the cards dont allways seem to do what I understand they should do. Maybe its just me, I'll play it a few more times later to see if I get the hang of it.
I noticed a few minor details that could help to polish the game a little. I know this is a jam game, so keep in mind that this are very small details that almost dont affect the experience, so in a tight schedule they shouldnt be priorities.
-Between your splash screen and the main menu you can see unity's default blue background. As your game doesnt have that color it stands out a little.
-While playing the game, I pressed the top right button to maybe open an options or pause menu, but it took me directly to de main menu and I lost my progres :(
-In the "how to play" menu, the arrows cycle through all the pages, it takes you from the last page to the first making it look like theres a lot to read. Maybe you could disable the right arrow when you are at the end of the instructions.
And thats it, the game looks really good and the idea is very interesting. I'm looking forward to play the story mode! I hope my comments were helpfull.