I Agree with CinemaLeo that this has a potential to become something great. Right now it is even bit boring, but the core concept of moving your guy to blow up the mines (along with yourself) and being replaced with another guy, is pretty funny.
Not sure what exactly should be done, but I could see there can be several different ways to approach this.
Couple of possibilities:
1. Party game - Players start in middle of mine field, each player has x nubmer of lives, and one to reach the car first wins, but problem is, you dont know where the car is. This means, it might be good strategy to wait before going to minefields first, letting other players blow, unless they happen to find the road to car already, being the incentive to go there first.
Also, maybe not x-number of lives, but for example timer, who reacher car with fewest time wins, and each blow is -5 secs for example.
2. Players dont necessarily blow mines themselves up along with them, but it could just be a possibility, like some sort of timer starting, meaning you could use mines to blow up other players when the timer starts somehow.
3. Maybe you can get bonuses on the field. You can see the bonuses, or bonus boxes (without knowing what is inside) and then some of the bonuses give you some sort of armor, giving you possibility to step on three mines until you die for example, and idea being looking for something, treasure among mines?
4. There could also be levels where mines are water mines, and players are driving boats.
Anyway, just random ideas to think about possibilities that came to my mind instantly. No deeper thought there.
Just that, the concept is great and funny, now just make it into a fun game still and it could be a hit.