It will be a turn based game similar to Pokemon style where user moves on a grid, and then chooses an attack, and then the opponent sees player move and their attack and their stats adjust accordingly. Continues until they are dead.
Very simple GUI, with circles representing player in grid. The main thing I'd want is the general setup made with the server communication and ability to select 1-2 attacks and have them based on the distance from opponent. I also would want a game lobby where all people connected to app is located in a chat room / typical game lobby. People can search for random match or request a fight with someone.
More work will be hired if workmanship is quality and quick.