This is level 1 of the U-Tunnel.
In this level, the ice tiles speed you up. So you can't have a character that jumps too far. Or too small a jump. Just about any character makes this level easy. So the suggested ones are entirely random.
The Duplicator is pretty useful in this level. His duplicates can increase your chances of defeating this level significantly, only if you know how to use him. Try to keep his duplicates with him, and you can try to jump off his duplicates when you jump through a gap, and this can prove to be really helpful.
Planet Stolen Edit
When you start this level, a cutscene will occur. More information about the cutscenes can be seen over here.
The Duplicator, appalled, says to the Runner that the Planet is gone. The Runner doesn't seem to care because she knows it will come back. The Duplicator accuses the Runner of stealing the Planet. The Runner ignores him entirely and tells him to help her map out the U-Tunnel.