Loving the new part of the level. I have a few issues to point out (some are in the first couple of areas that I missed):
The camera scrolls oddly here. Could you place an object in the screen above this?
I noticed you only used the double saw platform once near the start of the level. That seems like wasted potential - why don't you use it once or twice more in the first area (or towards the end of your level even)? It'll likely be underutilized in the hack, so it would be nice to see it given some love here.
A hidden 1-UP cloud or stars (from the Chomp Rock) would be nice here.
It's actually possible to get that flower without even using the yellow bullet to bounce up there. I can just shoot an egg from the left platform. You might want to move it back/around a bit so the player is forced to go up.
I'd put a flower in this part, or some other reward for the player reaching the end. Also, this helicopter portion is much, much harder than any other part of the level. Could you remove a couple of enemies to try and tone it down a bit?
Clever idea, but .. whoops, this sprite respawns and appears to be a bit glitchy.
Like before, great job on this. Looking forward to the end of the level.
P.S. I don't know why I can't use the insert link feature button correctly, nothing appears when I used it. Can someone help me on this?
and it should work.