It would go a long way towards evaluating the screenshots.
In the first screenshot, I have no idea. In the second screenshot, grab the shell and step on the platform, probably requiring the glitch where throwing the shell upwards while it's about to touch the lava will make it a Koopa...?
In the third screenshot, you need to avoid the football while waiting for the mushroom, and when it falls, grab it. Go to where the turn block is, and spinjump on it, then hurt yourself on the aforementioned football to enter in the skinny pipe. Enter in the vertical blue pipe and do that pipe glitch where entering the pipe while there are munchers above it and you're big will still make you big, but you'll have invincibility frames. Then go as fast as possible and crouch in the death blocks to not get hurt again and enter in one of these yellow pipes...?
(this is only based from what I've seen. Also the author need to link to the LM screenshots so they won't cause a table stretch)
Seems like you have uh... taken some things from hacks like MMD (mainly, the football bit and the fish and Torpedo bit), though I don't know if it is that much of a problem...
Anyway, you're doing good so far, except for the empty bottom of the first screenshot (you can also break the level by going under it).
I'm guessing you got inspired by Facedesk's third level to make that disco shell bit, with same music and all? Okay, I'll let it slide, but don't make the level too much based on it or then it'll become a "copy" of it.
As for the overworld, it looks good, but I noted a few errors which should be easily fixable:
In the first two screenshots, I can't really tell what is happening. I am guessing it's supposed to be a horizontal layer 2 section, though it has "Vertical Scroll at Will"? ...Nice. I'd love to see how it is implemented into the level, though basing on the screens, it's not too much.
In the third screenshot, I think it is fine, and the beginning is also cool, though as long as it's not directly copying I Hate Masks 2 from MMD2 it's fine. Also, you can easily take the key without touching the clouds.
The BG palette on "Cave of Distraint" is not appealing to me. Try to make better shades of grey, black or white in it, and you'll be fine. Also, in the last screen, you could make it a bit more difficult to ride on these platforms. Like, lower the muncher ceiling one tile and add some invisible note blocks under the last two munchers. Just a suggestion.
Also, why am I the only user in this world to comment on your work lately lol?