Hmmmm...
Energy Pendulums.
Wall Mounted Laser Turrets.Landmines.
Elevators.
Floating Platforms.
Dark Stages, maybe?
Sprint Pads (They make you run super fast in one direction)
Wall Spikes (Combine those with Sprint Pads)
A malfunctioning robotic dog head barking lightning from the walls.
The Emperor's shiny neon ba- *gets stabbed by an energy sword* AHHHH!
PS Last one should not be taken seriously, please