Nice progress so far. I saw the video and saw that the player can move back. So I thought how about "healing stations" instead of "healing items"? Items are usually one time pickups but healing stations are permanent. This can also be used as checkpoint for saving the progress.
In the video at the end of the stage, when the player has to jump+dash the obstacles, he may fall into the pit. He can quickly jump and climb the wall and go back and heal himself and then come back and try again.