I've never tried Battle Network so I'm absolutely not your target audience. Spoken that, I do believe artwork, look of the cards and overall style are great and consistent. Music does it's job and it was playable on the keyboard. Only useful remark I've got is one about difficulty, I was filtered hard on Earth and it's supposed to be 1/5 in terms of difficulty, it might be a good idea to let player learn through combat, go easy on him and then raise difficulty once he gets used to basic mechanics. But then again, fans of the genre are probably already familiar with them.
Game might not be for me, but it's certainly a lot of good work done, good luck to you.