For all the simplicity of the graphics and level design, the concept itself is interesting. In my personal opinion, if you make the moves in real time, rather than turn-based, it will add more dynamics and fun, in some situations, the player will provoke a move, and he will not end up making a move, staying with his number. I agree with the previous commenter, that if you add to this more players to control on, for example, "IJKL" or Numpad, and also add conditions on the surface itself, it will come out quite a drive cooperative fan game

I actually like the idea a lot and had fun playing it, 
Imagine if there were more than two players, some obstacles and real time chasing alongside turn based. Don't get me wrong turn based also works great since you have to plan ahead but the mayhem of real time would also be amazing. Keep up the good work :)