Hey Fich!
I'm happy you enjoyed it! We really appreciate feedback, especially when people have ideas about making it better.
1. Not quite sure about the jumping. The build that is here on Itch is actually pretty old. So most likely the bug is fixed. I'll keep an eye out though.
2. We will definitely disable the cursor when you're not in puzzle-mode. It's mostly enabled right now because it's easier for working in Unity if the cursor doesn't disappear all the time.
There are three more major mechanics that are introduced later in the game. Two of them interact with the 3D world quite heavily.
Thanks again for the feedback! It's really helpful and encouraging :) Have a great weekend!