Awesome idea, looks good, introduces mechanics gradually like a boss, level design is great - congratulations, this is an excellent entry.
However. :)
I had to give up after struggling with the level with the button on the high platform. Jumping over the metal barrier was quite a struggle (for some reason the metal is very “slippery” and seemingly pressing the jump button didn’t always register), but managing to get the ball (or an emergency crate) on the button is just way beyond my skill level (which is… not great, but not terrible either).
I hope you’ll update this game after the jam, because I think you’re definitely onto something here and I’m pretty sure a lot of Portal-lovin’ folks would definitely love to get stuck in this (figuratively) :)