Try going to the room on the right, and then returning
(It seems that going *past* the star is also a thing, but haven't gotten there)
- Go down and right to hit the 3-flag
- Go right, then die by moving up and down
- Go up and left to reach wormhole
Once you're in the 2-space corner:
- Hit the 3-flag again, then face left
- Go up, then right, then back down to align the top cat
- Hit the top 3-flag, then push the rock into the spikes. It pushes you back down.