What the heck am i looking at XD This is a very absurd idea, but i am liking it. :)
Some indicators before the ghosts/enemies spawn would be nice. Feels kinda random sometimes to crash into an enemy which suddenly spawns ahead of you.
Can you show, the guide how make a indicators before enemies spawn?
Depends on your implementation. Basically when you roll your next enemy position also start a timer. While the timer is still ticking disable the collision on your enemy object and maybe draw it with half opacity.