You also said you accept ideas. I have some, if you want:
- Bouncy Platform: A platform that acts like a trampoline, that automatically bounces you up when you jump on it
- Weak Platform: A platform that slowly moves downward when you stand on it
- Ice Platform: A platform with almost no friction
- Disappearing Platform: A platform that disappears when you jump off of it
- Pairs: A pair of platforms where only one has a hitbox. Which one it is changes when you jump on one
If you want to work with timing:
- Platforms that periodically appear/disappear/teleport
- Magnets that periodically rotate
Another thing that could make for interesting level designs would be something like a gravity switcher