Looking pretty good. There are a few things of note, though.
- All too often in hacks have I seen setups similar to what's on screen 0B where coin or power-up blocks will be set directly on ledge tiles that Mario can hit from underneath. Unfortunately, there is a glitch that can kill Mario instantly if he hits the blocks at a certain angle or while running at full speed. Here's a video demonstration.
Note that this is very unlikely to happen in this specific level, but if I point it out now, more people will hopefully know to correct it in future levels.
- This is a slight hang-up of mine, but I always found setups like the hills on screen 0B strange because they go behind other objects, yet Mario falls off the ledge when walking as one would logically expect to go behind the other foreground object. You don't have to change that, though.
- Also, the sublevel containing the goal has a potential blind drop onto a spiny on screen 04.
Good job on all the rest.