Great game and lovely idea. It really kept my attention and forced the brain to think. UI wasn't such a big problem after focusing on cards and game itself.
But you can't leave a player hanging at the end without enough cards to use.
I've completed 8 rounds, and in ninth one 32 is the best combination I could have achieved. I only have low cards remaining, which can't get needed 39 in any possible combination.
It's quite disappointing after invested time, and there's no any suggestion that it may happen, and that I need to keep bigger cards for later or something.
It just breaks the game, and it's not fair to the player.