This game is really cool! The game loop is addictive for sure and the artstyle is fire! I suppose there are some similarities to Slay the Spire 2. I believe this has the potential to be its own game.
During my experience, I discovered bugs with cards like 'draw 3 card' inconsistently draw 1 - 3 cards, 'Strike 3...' requires you to use the card 3 times meaning 3 health decrements and swapping another card inbetween will be counted as a strike. Sometimes, when drawing cards, the duplicates of a card will not be shown or able to be selected until the first instance of the card is played.
Also, the relics are simply too powerful, 'stone' reserves your shield for next round and even next battle and as I got deeper into the game, it became so easy that I can just stack shield and be basically immortal. One other relic that stops insanity lost completely throws the insanity mechanic out of the window for me. I find myself spamming shield and attack cards and disregard everthing else, although, the mechanics are really entertaining for a while. All in all, the game does not have any major bugs.
Nonetheless, this game is exceptional already, especially given the tight time constraint for a game jam entry. The drawings of the entities are such a nice touch :)
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Thank you so much for playing and for taking the time to leave such an incredibly detailed review! Hearing that you loved the core loop and the art style means a lot. The comparison to Slay the Spire 2 is a huge compliment, as it was definitely a big inspiration for the core mechanics.
You are completely right about the bugs and balance issues. Sadly, we just ran out of time for those bug fixes and balancing at the end. Also, thanks a lot for leaving such a detailed comment on the game <3 It really means a lot.