Thank you so much! I'm using Unity.
It's kinda hard to explain all the details of the possession and the dribbles! I did write an (unfinished) document with various details if you're interested http://properlydecent.com/blog/soccer_game_development_concepts I hope it can be of use for you :)
I'm not working on this game anymore (sorry!), as I'm busy now with a follow up game that has a league mode with player transfers and such!
I found your football game on Steam, looks so cute! Good luck with development :)