I should make that room less difficult, I guess. In that room, there is a hole at the left side of the entrance door, you need to use scale to make it small and then translate it there.
In the trap ceiling room, the solution is to find a transparent room and scale up the cylinder that stands there(or just throw it at the ceiling)
Not gonna lie, I gave too much power to the player when I introduced surfing mechanic. I think I will add anti surfing mechanic or something like that.
I dont think that puzzles seem to be not contained in one room. Apart from the final level, everything else should feel fair, though I did make some of them too confusing (like scale room). Maybe its just my IKEA syndrome.
Thank you for detailed feedback!