Nice pixel art work here, and it has some nice gimmicks with trying to figure out the synergies to build decks around. But there's far too much grinding necessary, and far too much repetition between games. And for a deck-building game there really didn't feel like enough variety in cards. Maybe I just didn't make it far enough into the game, but at least early on it doesn't feel like there's enough cards for there to be very many different strategies, and it takes a round or two to get enough resources to unlock a single new card.
The gameplay also feels a little awkwardly paced. With your character auto-battling and you just putting new cards down as they come in, it feels like you want to just leave the game idle, not giving it your full attention. But then with the speed cards come in, and the limited inventory size, you can't idle too much or you just won't get anywhere and end up losing. I think the issue is just that there's too much in the way of menial tasks to do with putting the same cards down over and over, without enough meaningful decision making in between.