I love it! It's really fun to play.
I played the web version first and then the download version.
To be able to see the decks is a great addition.
The music adds a lot to the game, but get's a bit repetitive after some time. The new effects are nice to watch.
Things I would improve:
- The text wrapping line while revealing makes it hard to read. I don't know gamemaker, but for godot you would set the clipping behavior to after shaping, maybe there is something similar
- Automatically end the round if you have no mana left
- Heal the character you played, at least a bit. I guess swapping characters is the main thing, but it feels like swapping everytime to heal is almost always the best strategy, also to have less cards seems to be better. Maybe be able to swap one out instead of adding a new everytime
- Beating satan felt a bit less rewarding than winning as satan, while it was harder to beat him, at least it felt like that for me