I love the concept of the game. A turn based game where you play soccer :)
I think the information dump in the beginning is a bit overwhelming (at least for me).
You could introduce the game bit by bit and let the player play with each new element.
For example first round could be only on one character to control to learn how to move. Then introduce the ball and one ability etc.
But that is one key problem every strategy game faces, it is hard to fit the right learning curve.
Also I found a small bug, I don't know what I did (think I pressed esc) and the resolution was changed to a higher resolution where the game only was in one corner of the window.
Best of luck and keep working on it, this one has potential :)