Smooth is fine, but this was like moving on ice. You stopped pressing forward, but the char would still slide. It was like the default Unity player controller. ^^
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I was able to finish it this time. The most difficult part is still "the floor is ice". The character takes a second to come to halt after you press forward and glitches off corners. In Unity I'd say it is a capsule collider without friction. I don't know how it is in Godot. :)
Still... this can all be part of the challenge and building and jumping is fun. Good job with that idea! :)