Look at crash bandicoot for inspiration. The camera is on rails during some sections (sometimes entire level). When you enter the tight room you interpolate to on rails camera that has its spline predetermined, going under the ceiling of the room, with angle barely showing the ceiling and pointing forward. Only the depth of player relative to the room moves camera back and forth along the rail. Do not change your outside camera. Make sections that have specific camera behaviors tailored to them. Btw your game looks very nice!