There is quite a lot here for a week-long game jam, so well done for getting so much in! I liked the move options available at the start: defend now, buff later, attack and heal or attack and do maximum damage. Well thought out! The pool setting was really unexpected after I read the story description on your game page, though I guess that surprise only emphasises the "strange place" connection to theme.
I did find a couple of cards confusing, possibly because you get to choose them quite early on. One was prickly shield - "if you block 100% of damage, inflict 0 (DEF 100%) bleed stacks" - why would I want to pick a power that inflicts 0 stacks of bleed (or would it inflict more if my DEF was higher?)
Another was "if this does attack does more than 10 damage, [some kind of buff]" but then the damage shown on the card does 3 damage - so I guess that base damage is increased by levelling up attack strength? It might just be a case of ordering or could just be me misunderstanding.
Nevertheless, you've made a fun Slay The Spire-like game in an impressively short amount of time, so well done!