I really enjoy these type of incremental/card games, so this was an interesting play. It was not clear to me at first that I needed to place the building cards in my inventory into the slots of locations, but once I figured that out, things went a lot smoother.
Is the card inventory supposed to be limited to one row? I fely like I was missing some scroll function to see the rest of my cards - the only way I found to see them was to place building cards then remove them (at which point they were lost) and I could see my other building cards after them.
It was also unclear to me how buying multiples of the same fighting card contributed to their overall value in a fight.
You had a cool story I enjoyed though there were a few frustations around inventory and tooltips going off the left side of the screen. I think the cards had some interesting interplay with the different monster types. I'm not sure the card portion added anything to the experience - usually games with cards involve a deck or some kind of shuffling/drawing/hand of cards, so maybe that part could be improved.
I have to give you bonus points for localization - having worked in the area of software localization, I know it can be a pain and its really cool that you implemented that in your game.