Interesting interpretation of the theme which I haven't seen before. Good job!
Nicely polished and felt good. Apart from the bouncy balls; god damn they were annoying. I quit when I got past one, then picked up a checkpoint at a dead end and had to go backwards back through it.
Not a complaint per se, but I would have enjoyed seeing more interesting / detailed environments. What you had looked good and is polished, but for a metroidvania I would like landmarks so I can understand where I am.