Thanks for the feedback. I meant for the slime whip to be a bit tricky and unpredictable, because having the player pinball around is part of the fun. Try holding the mouse button longer or releasing it right before you move to another platform. Also, in some spots you shouldn't jump off the whip onto the platform, you should just hit the direction key for whichever direction you're going in. Any of the high platforms with 3 slimes in between require that you back ALL the way up and then only use a quick slime whip.
Hope this helps. If I use this control system for another game I will certainly refine it.