I liked the concept of the going bust as you draw and deciding - should I attack now, or try to boost my attack. I feel that this is a great wee mechanic you've implemented.
Needed a bit more 'reward' through the game. Seeing some enemy attacks reducing your 'bust' level or maybe only allowing you to draw 2 cards or something would be a very simple addition. As you can tell - I am into this simple roguelite mechanic you've got.
Great wee game jam submission - kudos!