Sorry, these are two different issues.
1. When the character is touching some vertical surfaces, it looks like is not moving as normal
2. When I jump from some places it looks like I can not control it anymore, but jumping
For example, in level 2, I pass the first gate, and there is a ramp down. When I jump and reach the end of the room, the only thing I can do is jump and do small movements while in the air