Hey Shadree !
1 - 2) it's just a high score game! Pressing space during the outro resets the game.
3) There is no real narrative, the end is always the same. That would be a cool idea for a future version!
4) Each card have a theme and a color word in them.
- Red is denying, it throws a fireball that stun and reduce the size of the bubble.
- Blue is distracting, it freezes the bubble. Its power depends on the size of the bubble.
- Green is delaying, it pushes back the bubble, it also depends on the size.
I know this is not really color-blind friendly tho, sorry for that!