This was really fun! I had to retry the boss twice to win but I ended up getting it first run!!! I do have to say it probably massively comes down to rng cause I felt like I wasn't strategising so much as just trying to get the combo number higher and deck fixing out all high cards lmao.
I'm pretty sure this is a glitch but I can't see any of the numbers or descriptions of cards? I can only see it when I hover over them but I don't think that's intended.