This seems to be a nice variant on the game Lost Cities, more free-form and with more flexibility in your options (thanks to the multiple suits per card, the fact you can play the ace or crowns at the end too and the lack of a maximum predetermined number of expeditions).
It does seem to be a nice game and I'll be giving it a try :)
I wonder though, why the scoring works different when winning profit than when making a loss… Wouldn't it be simpler if when winning a profit you'd just substract 18 from the total sum? Does it really change the game a lot? I'm interested in reading your thoughts on this…