Thank you for playing the game and giving your own feedback!
The orb on the Wizard can be accessed later on even if you break the green obstacle and activate the checkpoint. (Though it would need 3 orbs)
The two bolts later require at least 2 orbs to pass over them. I think the only issue might arrive by breaking the blue objects on the left edge of the map. I don't remember putting a re-spawn action on them, as I was afraid of the player getting stuck in them as they reappeared.
I am gonna try to improve the controls with jumping and Wall climb.
Thankfully I did put a Restart Level Button on the pause menu, even though I hoped that no one would have to use it~