Fun card game! It took me a while to understand how the fusing mechanic worked.
At first, I thought it was just for saving a card for the next turn and wasn't taking advantage of making the cards stronger. I also didn't take time to check the other ship's stats to understand I need to have higher ATK than their DEF to make any damage to them.
It would be nice to have an X or some sort of mark appear over the places already visited.
Also, I think the game bugged on me after a few games, because the enemy ships would fire at me before I had finished setting the cards! That's not fair! XD
Great game!!