I saw tiny little bits of space at the edges of the screen so I stuck a portal up there and thought it was going to end up being like portal where the real game begins when you start to escape. Would have been neat if you kept doing the same puzzles over and over until you discovered that you could escape. I guess portal was kinda heavy handed with forcing you to escape. Anyway I got outside the level and fell forever, so I guess I got the secret ending.
Edit: I thought it would show the game I was a part of, but it didn't so please check out my game here: https://itch.io/jam/black-and-white-jam-8/rate/1483089