I stopped playing almost instantly because the card art is meh. It all looks samey and I can't make out anything that makes them unique. Little unit lost in the massive back ground. Zoom in and show us some cool art then I will come back.
Great idea, But it is violation of copyright and will inevitably be taken down. Also it's kinda buggy. I really appreciate your effort though and it looks like it could really go places
Got to the point where it wanted me to upgrade and shop. I did so but mission didn't go away and would let me proceed until I completed it. WHich I couldn't anymore
 "World War II: TCG"){kind=icon}
 "PokemonNXT 0.1"){kind=icon}
 "Cargo Shipment: San Francisco"){kind=icon}
Well. It's just the hint. You don't have to buy or upgrade at this point. You can select next level and start playing. :)