Hey yo thanks for playing!
I kinda forgot to turn off or change the sprinting thing for the tutorial section, it isn't meant to be able to go that fast early on but it's cool. There is a couple of ways to go above the door, ideally you would bubble the box in front of it and while being on it jump over the door, there is a chain thing that lets you climb to behind the door if you explore a bit of the level down below. Still I'm okay if you forced your way through as long as it didn't feel glitchy, which is something I'm still trying to fix.
I know that holding things suck but it's part of the point, I still don't have the needs to show this to the player but the character you control is a small and young lady who isn't very strong and moving objects early on it's inconvenient on purpose because later in the game you would get a spell that lets you move around anything physics based, even enemies, but this isn't present in the demo. But if enough people complain about it I'll make it a little bit less convenient I suppose.
But hey thanks a lot for playing and for the feedback!