This is actually one of the most unique entries in the entire jam, or at least that I found. Navigating a giant cube sounds like a fun idea but I don't think it was executed very well.
The games biggest problem is that it is too disorientating. The 3D effect and the change of orientation of the camera had a very negative effect on my experience. This is simply because I am not an astronaut and not used to navigating the world upside down or every possible orientation.
There is an easy fix for this, instead of having a compass at the top of the screen telling which direction your facing, give the floors and the ceilings there own unique color. This makes it easier to tell which way is up and which way is down. I understand that you probably wanted to give players the feeling of being lost so you made everything gray, but I don't think you need to do that. It is easy enough to get lost already.