Despite the entire issue with the games initial download and installation (to call it horrible, nightmarish and painful would be understatement), I found the game to be really interesting.
The game essentially has two components: an augmented reality one, using a webcam and physical cards and a virtual only game (which currently is what you are playing on steam). The actual gemplay revolves around using your creature to battle the other player, using a mixture of physical attacks and spell cards. In many ways, you can think of it as using cards to fight with pokemon.
Be warned that the game is, in essence, pay to win due to the CCG nature of the game. Furthermore, since you are drawing from a deck, you are hit a little bit by RNG as well.
On the negative sides, I find the English translation to be lackluster and the developers really need to spend the money to fix that before it would be accepted by an English speaking country. Furthermore, there are a lot of bugs in the game as well, but seeing how this IS an open beta version of the game, then I'm fine with that at THIS time.
Overall, I found myself rather impressed by the game and I am currently considering putting some money up for it on kickstarter.