one of the devs here, you didn't download the wrong version. About 2 patches ago, we reworked our entire level design and a lot of our platforming mechanics (wall grabs, crouching, jump pads etc) so we are reworking all of our levels to use these new features.
Two updates ago was the reworked Forest. This last update was the reworked Beach/Mangrove and the next will be the city rework!
Stay tuned as we are hoping to get this one out a bit faster than normal (thats the plan anyway!)