I've just tested it save stateless and so far its pretty nice, but I do have some nitpicks and errors.
Everywhere:
-(nitpick) I don't really like the dots on the trees if I'm honest, why not add some Berries/Apples?
-The coins should be more brownish, just enough to fit the level (I don't mean change the colour completely, just make it so that its a brownish blue and a brownish yellow).
-(Optional) You could change the states bar palettes to a brownish shade.
First part:
-Seems a bit generally easy, but I guess that's all right if you wanted that VIP feeling in it (Easy then a surprise difficulty).
Second Part:
-In Screen 0 & 1, there is grass cutoff with the slopes. Ether ExGFX would work or just (re)move the grass.
-In Screen 3, I noticed a log there. You could place a moon there for someone to fly up there =D
-To prevent stupidity from the original JDCGames Collab with its Castle Levels, try not to make the player travel so far just to die in the boss. But the langth seems fine as long as the boss in the end isn't too long.
Rate: 7.3/10
I really like the level actually, just fix these errors and the level should be alright and ready to go =)
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