I got all the way to the first boss, didn't beat it because it wasn't very fun to fight against.
That being said, the art direction and sound desing are simply phenomenal, you really nailed that Metroid vibe perfectly. And the design of the first boss was really cool! The ambience tracks can feel repetitive, they do the trick of being ambience but they don't hold my attention for very long like Lower Brinstar or Norfair get to do, I would make the actual loops way longer.
I also feel like the initial areas are way too small so it's hard to get a feel and identity for each one, so it ends up feeling more like Metroid Fusion than it's bigger brother Metroid Fusion. The fact that a lot of progression is hidden behind shootable blocks makes me feel like they are there without much rhyme or reason and it kinda defeats the purpose of feeling like a secret when they're so many one after the other.
Also, only 2 rockets at the start? Come on, at least gimme 5, let me have fun blowing stuff up! I know the drop rate of rockets is like crazy high but I still feel like 2 doesn't let me get excited to start blasting stuff around.
Overall I think it shows a lot of promise and it can be polished into a great game if you keep working on it. Again, the art is crazy good and the animations feel nice! But there's much more to a Metroid game than the aesthetics of it, and I just don't get the same feeling of adventure with Zordak.
Please keep up the good work! I'll be looking forwards to more updates.