v0.5.4: A New Item

Just a quick one before I head to daycare here.

I added one new Item. It's somewhat similar to the Piercing Chance one, but this is for your projectiles bouncing off walls. When you choose the Item when you level up, it gives bullets that you shoot +10% chance to bounce off a wall. This means a projectile must be shot out of your weapon to be eligible for bouncing. A projectile that you shoot and then bounces cannot bounce a second time. A projectile that you smack with your sword cannot bounce a second time. A projectile that you are hit with and then deflect because of an item cannot bounce a second time.

I am aware that the walls in the game can sometimes be off-screen. I am working on a way to figure this out. Right now the walls are set to be the along the boundary of the camera, but that is not the same as the currently-visible area. I can receive a signal when a projectile is no longer visible, but I don't know how to give that projectile a vector to then bounce off of. I'm working on it. I think the existing imperfect implementation is pretty fun so I am releasing it.