Yeah a crouch, stand flat against the wall and perhaps a ladder/edge climb would really finish of the stealth movement
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Most games you get stuck into for a platformer you realize right away how bad crouch is needed to hide behind crates and shuffle forward through a narrow passage. Immediately you have a stealth component and secret areas, adds a lot to the game right there. Ladder climb is almost mandatory now, needs to climb ladders to access new areas.