Definitely a solid start, but as others have mentioned, I would recommend working on the feel of the player movement, and making sure the platform placement doesn't hinder jumping. But keep at it!
Viewing post in Ziggy's Acorns jam comments
You can jump and hide at the same time. Hiding makes you smaller so you can fit through the smaller spaces. Might not be visible because the jump animation stays the same size.
You can also jump first, then move while in the air.
With both you should be able to fit through all the spaces between plarforms.