I think the idea of an on rails shooter metroidvania is really interesting, and the aesthetics were cool.
I'm not sure if its just because I'm not used to playing games like this, but my problem is that it was super difficult to navigate around and know what to do (which I think in this case the art style maybe made it even more difficult by simplifying stuff even more).
I managed to reach the the 3rd area (lattice zone?). But I just couldn't get past it and it was really bright so it was even more difficult to see.
Some other small stuff I noted: probably make locked "gates?" more obvious, it took me a while to figure out what they were, as they only had a subtle bubble around them. Maybe make your projetiles a bit bigger too? It was a bit difficult to aim to enemies, specially because they were kind of small (could also be I'm bad, my only experience is star fox 64 which did that)
playing it was super interesting, and seems hard to pull off this idea, which makes it cool to see if you can improve on it.