This game is excellent. The first set of cards are great as is the candle from the second set, I wasn't so sold on the next set. It may be worth looking at game Crying Suns to see how once you unlock a new type of battleship you commit to playing with that for the next run, in the same way you could have decks you commit to. Maybe you can have neutral cards that work across all decks.
Very captivating overall for a simple game! Graphics and audio were great too.
The prestige thing could see some work continuing on it.
Another thing that would be great is if I could restart in the middle of a run.
I really like the animation speedup.