Huuu, I understood nearly nothing, really, I destroyed an enemy with a fireball, I placed a card on the field, punched and enemy but I couldn't pass my turn or do anything significant… I must be stupid or something.
I don't see the black and white theme, nor the puzzle :/ Maybe it's totally a misunderstanding.

Nice work. I was able to make it to the end. Although I did have the glitch where you can't restart on the first level with the dark portal. Sadly that gets really frustrating as it takes a bit of trial and error to figure out how to use the portal, which means playing through again after reloading. Once I understood it, the puzzles really came together. I think the main thing needed is a better way to make the player understand how the portal works. Great job.

It's a fun concept, but even as someone who plays Hearthstone and similar, it was hard to understand what to do at first. And then when I reached the dark portal level, it started glitching out and I couldn't restart or continue!