Too bad for the bug as it really kills the gameplay so we have to restart... But hey, that is the kind of things happening in Game Jams right ? haha
I agree with comments saying it needs a short explanation on controls or way to play. I discovered you could knock your head by accident, I discovered you could deflect enemies shoot also. The gameplay becomes quite fun when you have all cards in hands!
There is two fonts used right? I feel like they do not completly blend with the rest of the design... Personal thought :) (And who am I to say this, my fonts are the worst :p)
Nice touch for the high score being saved and shown in the menu, it makes us want to pump those rookie numbers ! ;)
Anyway, good entry, well done !