The idea is novel and brilliant. Nonetheless I have a few suggestions:
- The card-playing process is too random. Having no means to improve my chance of getting 11, I find the best strategy to be spamming cards, which is not engaging and frustrating with bad luck. I suggest instead of directly playing the cards they draw, the player has a way, like catching or shooting power-up bubbles they've drawn with the fighter, to select which power-ups to apply.
- The deck building process is too random as well. Some cards poison your deck, for example 10 busts with any cards except 1. After the first few waves I did feel my deck improved, but thereafter I am forced to accept cards that are useless if not harmful to my build. There is undoubtedly strategy element in keeping your deck clean, but better in building it strong.
- Tune down screen-shake, preferably remove screen-shake upon enemy death so the player can have a better idea when they get hit.
- The delete button (the bin) is redundant. Clicking has no effect outside delete mode(?).
- Explain what the green bar at the top does.