Enjoyment 3/5: What's here is serviceable especially for a jam game! Not "time of my life" fun but not miserable by any means.
Execution 4/5: There are a lot of minor conveyance issues in the tiling that make things a little more difficult to understand, and there's at least one notable glitch. But nothing gamebreaking by far, it's more a few design issues and extras keep this from a fuller 5/5.
Sensory 3/5: The music is nice enough, and the tiles are pretty decent to start with. There are a variety of enemies to look at. If the initial style of the tileset had been more consistently applied I think this category might have been higher, and furthermore I think this one might even have warranted a 3 or even 4 on theme.
Metroidvania 5/5: By jam standards it feels at least adjacent; only two mobility abilities of substance. The level design feels fairly linear; there's not much in the way of a larger interconnected whole here.
Minimalism: 2/5: You did stick to your interpretation of the theme, but it's not clear what differentiates your interpretation from merely being a Metroidvania which is a separate category. theme you interpreted appears to have been the same as the genre and not really minimalism in much of any way I can 'grok'. Still, making this a 2, if for no other reason than because the initial storybooky style felt a little minimalist in its own way.
Some video-format feedback below: