Every thing looks great but it took a little bit realizing that the tutorial numbers correspond to yellow (or green arrows) with the same numbers. You lost all the players who left before figuring it out. It's not hard but some people miss the obvious or don't try.
Finally NOTICED a worker duplicated a craft because that must the only way I have 2 in stock without buying. But you could announce it with a bit more excitement and notiability because I was quite annoyed at not seeing it more or earlier.
The boss health bars go behind the buttons at the top and cannot be seen. Since they cannot be clicked on I don't think it hurts to bring them to the front. Firefox Windows 8.1
WARNING: The simplicity at the start does not do the rest of the game any justice. I only made it through because I was very bored of other games. However, once you acquire cards with a range of different effects, the strategical scope of the game opens up immensely both in both -in-game tactically play and pre-game choosing the cards for your battle. And then there's the shopping element of where to spend your coins.
The campaign dialogues are brilliant. The cards quotes (you see when loading a match) are written by some dyslexic equal-opportunity charity placement.
Music and effects volume controls are available via the "Menu" button.