It's a fun little game with potential.
I found an odd bug and I think it works like this (though it only occurred after level 19). After selecting an expedition the ship selection screen opens up. If this menu is open while another expedition ends, then the tick to select a ship doesn't work. I must wait until all my ships have returned to base before being able to send out a new expedition.
But with everything you've included in the game so far bought, there's no reason to keep playing.
I'd probably play it if it were a full game, but unless there were some automation included at some point, my wrist would die.