What an awesome game! However, I think the game balance relies too much on vulnerable debuff as they allow for exponential growing damages to the point it is totally broken (I know all roguelike deckbuilders are all about being broken, but this is too far easy-to-play and broken so other builds aren't interesting). I think buffing other builds and nerfing vulnerable debuff will give them a shine they deserved.
Anyway, I hope to see an expanded version of the game in steam as this is too good to simply be a gamejam submission. Thank You!