Good little platformer game :-)!
Nice concept for switching between light and dark and different platforms. It was a bit hard and difficult for me. Died a lot. Could be me but the game was not really forgiving when jumping around ;-). Did like the transition from falling to your death back to the checkpoint. Nicely done. Some extra variation or enemies in different modes could be a fun addition for a possible update.
Visual pixel style was good. I like the character looked like Godot :-)! Nice detail. Audio was also fitting for the style of game. Theme checked.
Overall a well-made game jam entry! Keep it going!