I'd like to note some things:
1. The SMW lava recolor is kinda weird, try to find another kind of purple instead of using pink at the top.
2. Why is there a floating warp in the 1st screen? (I can't play this level right now, bythe way)
3.
There's a little cutoff with the vine in screen 2.
4. There's a cutoff with the cave tileset and the lava recolor in the screen 3.
Other than this, this seems to be good. I like that gimmick with the spring things in screen 4, by the way.