Didn't play the first demo. Movement felt OK, but I was really struggling to gauge how far I was going to be able to jump, and it felt kind of clunky that I could throw while jumping but not moving. Couldn't beat the last two levels of the first hub world and gave up. Having to restart because of how easy it was to get stuck was a pain - I wished I could just call my magnet back to me tbh!
Oh and in the hub, I totally expected that I would go into the tube and do a Mario - didn't even occur to me to throw the magnet until I did it by accident.