I found a glitch where you can push slimes off of there platforms or even into walls. When you touch a slime, you push him a little bit away from the direction you came from and this it what I abused. To push him off from his platform to make him fall down below onto another platform or even spikes, you have to "get hit" from the slime when he is as far as possible on the edge of the platform, he will then fall off. Pushing a slime into a wall works pretty similar, he needs to be near the wall you want to push him in and then you just get hit by it. It's even possible to softlock the two slimes at the end section, if you push the upper one onto the platform below.