I really enjoyed it. I put 30 minutes in, and there's certainly more content that I did not see. It has a very satisfying card battler feel to it, something similar to Slay the Spire or Darkest Dungeon.
The highlight for me is certainly the pixel art, everything from the enemies to the background are crafted so well that it really makes it stand out. It would be cool to see more animations from the various characters on screen. The hero/main character doesn't really have much going on.
I didn't quite catch on to how the cards stacked immediately, but once I did I was able to make use of it pretty well. It would be nice if the cards popped up a bit more when we hovered over them so they don't have to be selected to read exactly what they do. But, overall really fun experience.