Unfortunately, this game has quite a few problems. My biggest issue is that while the basic idea is good, but I don't think it was implemented in a very interesting way. I was expecting that I would need to switch back and forth between the two worlds to get through a level; maybe I'd see some spikes in the black world, swap to the white world, walk past the spikes, then swap back to the black world to be on the other side. Instead, swapping worlds seems to reset the whole level, meaning the whole level has to be done without swapping. All that that you really use the world swapping for is forcing you to be in a specific world to finish the level because only a single world has an exit. This was disappointing; if you wanted to keep going with this idea, I'd recommend trying to tie the worlds together more closely so that the player keeps their position when swapping worlds to allow for more interesting situations.
I also had some other minor complaints: there's no sound, dying seems to force you to restart the whole game because there's no respawning mechanic, at one point my character tipped over a ledge and landed on his side, messing up all my controls (you can prevent this in Unity by locking the rotation of your RigidBody2d).
All that being said, it takes a lot of courage to do your first game jam, and hopefully this feedback will help in the future.