Shocked this doesn't have any reviews so thought I would add a comment that this is great work creating a puzzle game using negative space as the hook.
I liked the interplay of the black-white spaces and how the areas weren't quite perfectly symmetrical to make navigation part of the puzzle solving. I think the puzzles work best when the inverted spaces require the player to consider different movements and solutions in the black and white sides of the game.
If you want to build on this idea, have a think about how the puzzle design could exploit the fact that the player may need to multitask doing completely different objectives or avoiding different hazards to meet the same goal in both spaces.
For a jam game there's plenty here. Also the visual design is super cute and simple - not very often you get to see the spritesheet in the background of the page!
Great work! I had fun playing this!