2d platformer final

This is my 2D Platformer project, including the following modifications/additions:

- The addition of an invincibility pick up (the yellow pick up introduced in level 2) that gives the player invisibility for 10 seconds

- Complete second and third levels, with new enemies and items

- A new guard enemy, found in level two by the door, with modified behavior including: faster movement, increased health, and movement between waypoints.