Hi! Its always awesome to see 3D metroidvanias, so I really liked this one!
I liked the upgrades and secrets to find, the game also gave me some Metroid Prime/Dune vibes but in a Nintendo 64 style, probably because it made me remember of the game "Armorines" for N64, which was awesome. Also Shooting the rifle on enemies was satisfying especially after the automatic upgrade, and the red circle effect when shooting surfaces had a really cool spread effect.
The only problems I had where that some of the areas where too similar, and without a map it made me quite lost sometimes, maybe more unique colored areas like the abyss could be cool. And also the breakable rock walls where a little too hidden sometimes, since they are the same color as a normal wall, but if the idea was to make them actually hard to find, maybe an audio cue could help instead of making them more visible, like a wind whistle coming out of them. Also, some more audio variety could improve the overall game, maybe a light soundtrack or different ambiances for different areas could make them stand out more. And finally, I imagine it was because of time constraints, it was a shame to see that there was no final boss, I was kinda pumped after finding the final missile upgrade to shoot my way trought the end, but it's understandable since its a 3D metroidvania for a game jam, which is already impressive!
Overall, this was an impressive entry and fun to play, it would be awesome to see a final polished version with the full ending and improvements. So congrats!