Enjoyment: 4/5: Quite enjoyed this one overall!
Execution 3/5: I recommend working on conveyance of when/where certain abilities can be used, making the use of the circular objects more intuitive/east to get, and also including save points. For all that I do think the base swinging mechanic, while it may need some refinement, has been nailed down pretty well!
Sensory 3/5: The visuals are nice and simple; the sounds are there, and not bad. The first 'intro' boss is a highlight.
Metroidvania 5/5: Multiple mobility abilities helping me traverse a space I have to meaningfully explore? Check! And for the purist in me it's also a platformer so double check!
Relevance to Theme: 4/5 You did a pretty good job of following up on the theme interpretation. The chosen interpretation did make the game a little harder to understand, though.