OH NO GAMER;
When you reach the final room you need to reach the top and defeat Jimbo.
I'll start from Earth;
Kill the guard standing on Mars using your ranged attack.
Double jump onto Mars.
Wait for an asteroid to appear from the left of the screen and jump onto it.
Stand on the asteroid until it takes you close enough to the ladders for you to be able to jump onto them.
Climb the ladders.
Kill the guard on Jupiter.
Kill the guard above you and jump to Saturn's ring.
Jump to Neptune (on the right).
Jump onto the UFO above you.
Jump onto the wire above you and zip-line to Pluto.
Use the smoke from the crashed rocket to glide up to the UFO above you.
From the UFO, use Barts ranged attack to attack Jimbo's space ship (it takes around 20 shots).
Voila! You have completed the level!
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Phenom