I generally like traditional card games, trick taking games and ladder-climbing games. Some favourites include Tichu, Ninety-nine and Haggis. Recently I have had a lot of fun playing a new ladder-climbing game for 2 players called Crisps. I have mainly played online on Board Game Arena. Ladder-climbing games is generally not very suited to two players, with some exception, and Crisps is one of them.
The object of the game is to empty the hand, but every time one player passes the winning player chooses between a face-up card and a face-down card, giving the opponent the other. Thus, the hand gradually fills up and must be planned for. The combinations in the game strikes a nice balance between strictness and flexibility.
Would whole-heartedly recommend it.