I really enjoyed the gameplay on this, the moving doors was really funny, and the control swap had me stumped for a WHILE, its good fun!
For art I would recommend trying to keep the line-weight/resolution the same between all assets when working with pixel art as when they don't match it can look a bit like an asset-flip and also can cause some confusion between what is background and what is foreground (especially important in a 2D platformer!) but this is otherwise really solid and with some spruced up visuals it has all the makings of a great game :D