It's a good game. It did crash for me at one point, but you were right when you said that everything would be fine after reloading the game. I played one of the earlier titles, and really only played this one because I had liked that other game.
It gets boring after a while to be honest. I'm almost done the easy play-through (after already completing the casual), and I'm not quite hooked.
I think that it has to do with balancing the cards. I am probably not doing it right, but I frequently have to discard cards. Not that this is necessarily a flaw, however.
I can't help myself from locking in my own play-style. I focus on trying to increase resource production, try to keep myself barely alive, and then just blast the enemy with ambushes and trojan horses.
4.5/5 only because the game can be very slow and is repetitive. I would say to add more card variety, but that is up to you.