Nice and simple classic runner and dodge game. However when you said "timing is key", it gave me the impression that this game will have timing-based mechanics which it does not. The theme applied only to the narrative, no elements in game feels "against the clock". I hope there is at least a countdown timer of the mines explosion. But this is an endless runner so it won't work.
To fix this, I would make it into finite runner instead. Where player need to reach the finish line, avoid the obstacles that will slow down (not kill) player, and there is a countdown of explosion displayed below. When timer reached 0 and player still did not reach exit, then it is level failed with explosion visuals around the screen.