I went back into the Brain Tumbler and killed the thing I couldn’t kill previously with my new shooty power. After progressing a bit further, I came across a tower, but couldn’t climb it all the way as I was told I needed to use levitation – something I couldn’t do.
So I could out of my own mind again, and sought out Milla, who could teach me about levitation. This mainly involved getting to a party in her mind, which was pretty easy. I had to race some other kids through a section on the way there, though.
Now I can go back to my own mind and climb the tower again…