Another small suggestion: Put some platforms above Emerald Cave, and while you're t that maybe change the background for a more eye-pleasing one?

Bump:
You know what would be a neat stage? Magnet Train from PKMN HeartGold/SoulSilver.
Basically like this:

I have a weakness with stable Smash stages with moving backgrounds that don't affect the match (which is why my favorite stage in Skullgirls is New Meridian Rapid Transit)

Oh baby a triple!
(Been over 3 weeks since someone posted here)

You know what would be neat for Starship Mario? Having Comet Observatory from past versions as one of the "Galaxies" the stage can visit.
I always felt Come Observatory to be a really, really fun stage and I mourned its removal in Beta (though, the change was perfectly understandable)

Since Starship Mario is already the standard version (and the only one accessible without Hazards), I thought it might be neat to keep Comet Observatory as a location with Hazards On since Hazards are restricted for Casual Play

(Or do a Project M and make Alternate Stages)

+1
Plz