Stage 1 Boss: Sparkpod
The main pod can be damaged by using the fans, and the machines that shoot electro balls in an arc can be destroyed by Laser Trident. The main pod has actions similar to Spark Man, excluding jumping.
Weakness: Laser Trident
Stage 2 Boss: Arachnid Chaser
It chases you past a set of blocks like the Mecha Dragon. You must fight it on 6 blocks, It spits clouds of venom to attack.
Weakness: Black Hole Bomb
Stage 3 Boss: MechaCF
It swims around the arena. It can shoot bubbles and cubes of ice. It hangs out at the top most of the time. You can use the water's buoyancy to damage him.
Weakness: Magma Bazooka
Stage 4 Boss: Light Pinner
It flies around and tries to pin you down with a big needle. It can also shoot orbs as a counterattack.
Weakness: Tornado Blow/Hornet Chaser