Thanks for the feedback! Yeah, audio would definitely help big time!
For the other things you mentioned I had at least briefly thought about most of them. Definitely want to have another control scheme where you actually hold the cards and whatnot, but figured the control scheme I went with was better from a tray table perspective.
I for sure intend to add more cards/powerups/buffs/debuffs/enemies/etc in a full game. More planets and locations as well.
I like the idea of shaking the ship when you're hit. Between that and audio I think things would feel better without even adding all that much.
Thanks for putting together a great jam! +1 vote for a week-long jam next time! :)