It's an interesting concept, but it definitely needs a lot of work. My main critique is that the cord is so short that it makes it almost impossible to avoid certain enemies by the time you can plug them in. Also, the ghosts looked oddly like zombies which really bothered me. And I didn't like that they could go through walls. That mechanic should have probably been saved for a more challenging enemy, rather than the first one presented. I also greatly dislike the idea of the areas closing so you can't leave until you defeat all the enemies. Instead, it would be nice if you made it so that the door to an undiscovered area only opens if you clear the room, but the door leading to already-discovered rooms remains open.
A suggestion for how to improve this game later on, is to possibly have upgrades for the laser gun, such as a longer cord or a faster firing rate.
I will admit that I did not play all the way through this. I stopped shortly after getting the first key because I simply found it too frustrating. For a person not a fan of shooter games, but decided to give this a try anyway, I found the difficulty a bit bothersome.