Where are the Enemies Come From? (VLDC 14)

This is my entry to SMW Central's 14th Vanilla Level Design Contest (VLDC 14)

Link to level thread and download:
https://www.smwcentral.net/?p=viewthr...

This level takes place in a factory that's responsible for producing the enemies seen in Super Mario World. It features pipes that produce enemies at regular intervals, as well as conveyor belts with 2 different speeds.
The level also has a storyline, which is explained via on-screen text as the player progresses through each area.

This is the first time i've tried to execute what's known as "VLDC aesthetics", in which we can manipulate vanilla SMW assets to create new tilesets. I'm really proud of how this level looks in the end! haha