Here are two different ways to make a camera
1. Give the player's character the ScrollTo behavior
Simply give the player's character the ScrollTo behavior. This is quick but is limited.
2. Give a separate invisible camera object the ScrollTo behavior
Make a an invisible sprite object for your camera. Give it the ScrollTo behavior. Now make the camera follow the Player's character
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Regarding your health bar and item, check the layers' parallax settings. A parallax setting of 0 x 0 will result in objects that never move in relation to the camera- they stay fixed in 1 spot on the screen