This is really great. I'm always so surprised at how good level design can be in a game jam. I loved how triggering switches on the map would open all vents, which meant that returning to an older area meant I could usually explore more with the new vents I'd opened. like others have mentioned, I think the combat felt a little secondary, maybe a bit too simple. Other than that, the platforming is very solid and the level design is great!
The music was also quite good (although it didn't seem to loop, so most of the game was silent, not sure if that was intentional to be atmospheric or if it was a sound bug in the web version).
Nice work!
edit: I forgot to mention, I really like the art style! I know most games at 64x64 resolution tend to have similar art styles, but I love the 'spaced' art you've created, with minimal outlines and spaces to suggest geometry. I think it's really stylized and works really well!