Lots of potential
Firts of all, its pretty good for a demo. The graphic look a bit like the skyboarder thing but i dont realy care. I guess it's your style or something. Ill just keep going with my sugestion:
Firts, you should make the flashligth more usefull. Maybe some kind of ghost you can only see when you look at them with the flashligth or some cave or castle or place too dark you need the ligth to guide your way trougth.
Second, since the game is called "The Ghost", the ghost should be harder to kill, like 2 or 3 shoot. It will be even better whit a knock back effect.
Third, when you pick up weapon, you should be able to switch them whit number key. Also, if you put ammo counter, its never fun to run out of ammo. So be sure to balance that.
And finaly, when you get close to a enemy, dont change the auto-switch to the knife, it rocks! Oh and add zombies! I love zombie.
I hope I was usefull to you, and sorry for the bad english. I'm hoping to see more from you!