Very nice StS clone. I'm actually digging the aesthetic. At first I was skeptical about crits, but they aren't that disruptive, especially since enemies can't do them.
The cards could be a little more snappy (the hitboxes of enemies are smaller compared to StS, which made me end a turn without playing a card few times). The healing beam deals a lot of damage and single-handedly won me the game. It also seems that there's a lot of multi-hit cards, to the point I didn't see another viable build outside of those + Focus gain. I haven't stumbled upon any bugs either.
You should also make the enemies follow a specific pattern. Right now it seems they're completely random, making stuff like giving you Frail few times in a row. In StS they have a set rotation, like Attack Attack Defend, and they can start 1-2 steps ahead.
World needs more good single-player card games, so keep up the good work.