It looks like a variant on the game War - popular with a younger crowd, not as popular with adults because of the simplicity. However, your additional rules and special cards add a little more of a challenge, so you might find some more interest in adults. Fortunately, one doesn't need to be a football/soccer fan to grasp the rules quickly, so anyone can play and find some enjoyment in it. It makes for a good "beer-and-pretzels" game, played for fun with a handful of friends - except for the fact that it's a two-player game. Perhaps you can craft rules for four or six players, functioning as two teams? It has the potential to be a fun party game, and football is more of a group sport than a two-player sport!
I would recommend a slight redesign of the cards. Most of the people in the world are right-handed and will hold their cards in a right-handed fan, with the upper-left corner exposed. On your cards, you have the most pertinent information in the upper-right corner instead. I'd suggest creating a index for the upper-left corner with all of the most critical information located in it.
I would also recommend using a border around the card faces that's the same color on all the cards - I've demonstrated before how a stack of face-down cards with identical backs can actually be identified by their edge when they have different-colored faces, meaning a sharp-eyed player can identify the color (thus the "country") of the card that's next drawn. Just a thin border of any color will do (white or black would probably be best for your game). A thin border is enough to make all the cards the same color at the edge, thus indistinguishable in a face-down pile.
A white border on the faces AND the backs will allow the cards to last longer - because they're printed on white paper, cards with black at the bleed will show the paper chips at the edges over time and wear, exposing the white paper underneath. It's why most poker cards are white-bordered.
I would even take it a step further, taking any game-critical information at the bottom of the card, incorporating it into the index design and making a double-headed card design with double indices, like a traditional poker card with "right-handed" indices - the art can simply be two vertical players, one right-side up, one upside-down, so one of the two will always appear right-side up no matter how the cards are oriented. It relieves the players of having to rotate the cards themselves in play for them to be readable, which in turn reduces the chances of accidentally exposing a card to an opposing player.
Good luck with your Kickstarter!