The level is nice, just a few issues that should be taken care of:
- Sprite memory issues (just change the sprite header to 0A or 10)
Repetivive sections like this are not even fun. Jumping on koopas to avoid lava pits; an error like in the screenshot and you're fucked. Put platforms or replace them with something else.
Also I made a new palette for you (showed it on IRC).
those jumps and the sprite memory and it should be fine.