Core mechanic: Team builder.
Secondary mechanic: Fight other peoples teams.
Progression: after each fight you can update your current team.
If I could develop further I would try and add more modifiers, some sort of chef system where you will be forced to cook a certain way (vegi, all meat,...) and also make this an async multiplayer.
I hope you liked the game, feel free to leave comments/feedback, it would be greatly appreciated.