I really liked the game, so I'm going to be nitpicky.
- I agree with XCVG that this game needs some sort of tutorial. However, I think on my second walkthrough I was able to figure everything.
- I don't mind black and white esthetic, however, UI needs some work. For example, the victory textbox doesn't look too well, because it has the same width as a screen. I think it should be shorter.
- The interface is a bit unintuitive. Hints, about where you can go next, or which card you can use, should be more noticeable. Also, what items in a shop do wasn't immediately clear for me. This leads me to the next point.
- When your health is full, you can still buy it in a shop. I felt for that.
- I think this game would benefit from having difficulty settings. Or at least a hard/challenge mode. As it is now - after you finished a game once you are pretty much done. It is not even that difficult, once you get the hang of it (it took me only 3 tries).
- Sometimes game decides to play two music tracks at once, which sound like a cacophony (one way to achieve it - is to press the reset(?) button (I'm not entirely sure what this button does, actually, but it has a spiral on it))
- Speaking of bugs, if you end your turn while your character is moving, and one of the enemies attacks him during that moving animation, he kind of gets stuck.
Speaking of what I liked.
- Music is great.
- Exploring the game mechanics was pretty rewarding.
- This game is pretty balanced for a card game. At no point, "random" was something I could blame for my failures.
- I think the whole concept of "combos" is rather new and creative. Take this with a grain of salt, since I haven't really played many card games.
- As a whole, gameplay fun and captivating. I had a lot of fun playing your game.
Overall, this is a very solid entry. Very nice job indeed.