Update
This is the lever in action. Biscuits and Cofi can both use the lever system. Right now in the game the lever opens a single door, I'm pretty satisfied with that. This opens a lot of puzzle possibilities. 
In the GIF you can also see the mini burger 
A mini burger is just a burger with some googlies eyes on. What's the lore? I don't know I was thinking that the mini burger is like a kids meal toy but am still iffy on that idea. Maybe it's just a burger with some eyes.