I am not sure it's possible to win with only arousal.
I almost forgot but there is only like 5 diffrant one cost cards in the shop and two of them make you lose the game.
I just finished a run that took 170ish turns, I was playing as the purple shrinking shrine maiden facing the dog girl at a size diffrance of 2:2000. she filled my deck with about 6 slobber cards a turn, made me discard a card every time I played a card, and I couldn't charm her without it going back to 0% each turn. (to be fair I guess she didn't attack which is the only reason I won.) I had to convert the energy of the deck from purple to green to do any damage.
most of this problem was caused by "earth shattering bark" that card well forever be my downfall.
this is a really nice game all things considered, I had fun playing all the characters and seeing the backstory of how each got to play in this game.