Very beutiful art and incredibly creative concept for a game. Really want to see this evolve and grow!
However, it does feel like it needs to evolve. Currently the strategy ends up being to simply use the bigger numbers when they are avaliable. Same thing when selecting new card pieces. While some abilities are very interesting, they are entierly dependent on your character having enought life to survive and attack (except for the knight, wich ended up being very good)
The difference in power between regular enemies (can't lose against them) and elite enemies (you are almost guaranteed to lose life) is elso very jarring
The extra abilities you can grab, while powerful, also felt unbalanced. Specifically the one that reduces enemy attack since, as I said, your heroes surviving for longer is extremely important. Also might have found a bug, the skeleton that increases its own attack would bring it to "it's original attack + 1", even when debuffed
Overall, love the concept and can't wait to see more, but still needs a lot of polish