Man, they always nerf Goku in these crossovers. Also, Goku would've never just let Sidious commit all that evil after their first encounter without confronting him again just as he would've Frieza. Story was good until that point.
Here's a thought for another universal crossing... what if Goku entered the universes of He-Man and She-Ra? That would be interesting to see what you would come up with...
2:38:38 So, instead of going Super Saiyan 2 or 3 or Blue, the A.I. decides that the self-destructive Kaio-ken was the next play? Goku can move at massively faster than light speeds, can solo any battle in a single sector of space. This should have been an effortless stomp. Emperor Palpatine had the only correct play earlier: multiple simultaneous offensives across different sectors of the galaxy, forcing Goku to choose who to save and who to sacrifice, until his anger erupted, bringing him one step closer to opening to dark side manipulation.