Really enjoy the concept, it is quite original. It would cool if there is a easier way to escape when someone spotted one, or maybe make it easier to spot the enemy coming. I like how you added a few reference to other games like hitman, enter the gungeon. Maybe adding different kinds of weapon or enemy would be a good idea too. And maybe the bullet can be used to break a object or trigger a button, the possibility is endless! The monochrome graphic fits this stealth game very well, great job!