Cheers for submitting something partially finished--I'd like to see that be normalized (though I'm also speaking selfishly here as someone who submitted something partial to Eggjam #1). The concept sounds cool! And seconding what MatthewLacker said, moving platforms and slopes can both be tricky to implement. I'm wondering if there might be something funky with running at high refresh rates--I'm at 144hz and my jump height was off the top of the screen! Anyway, good stuff, looking forward to future entries!

Thanks for submitting - I enjoyed reading your plans for what else to add to the game. Its a cool idea and I can  see a ton of potential in terms of stacking objects and having different arrangements of platforms and pulleys. Kind of like a Lovers in a Dangerous Spacetime  type thing where platforms and pulleys are a "vehicle" that you have to pilot. 

Also props on getting moving platforms to work, those are tricky!