That’s neat, feels very classic Metroid! I think it hits a lot of the same notes, though it also leads to some of the same problems, i.e. “oh, I thought I found progress, but it turns out it’s just another missile tank I don’t really need”. In general, combat was never challenging outside of the final boss (at which point I was so tanky that I could pretty much just facetank it), but the secrets themselves were fun to find, so I didn’t feel too bad about the rewards not being that interesting. Aside from that, I echo a lot of the sentiments of previous commenters about a lack of polish, which is understandable if you ran out of time. Hit feedback (i.e. the enemies flashing or having particles erupt from them when they get hit) would’ve made things feel a lot better for example.
Good job though, a nice amount of content for a jam game, satisfying to play!
P.S. The boss scream is so loud, holy hell, I turned the audio up cause the rest was fairly quiet and it scared the shit out of me