Really great game, and shows how a jam entry really doesn't need the most complex mechanics, story, or other assets to be really good! I got to -416m before I figured I'd seen most all of what there is.
Since I try to leave some constructive feedback on every game I play, I do feel like the late-game neccessitating lots of hooks kind of punishes the players who find really good optimal routes with hooks as they're forced to relearn those areas in more time-consuming and uncreative routes in order to save hooks for the end. The down-thrusters for lack of better name also had too large of an impact on the dive imo since I would often get much higher than before but miss one or two of them which felt like my accomplishments were unrewarded. And then when I finally strung both getting to a similar height with hitting all the down-thrusters it just felt like I progressed because I happened to hit them on the way down. Maybe I'd feel better about them also if it felt like there was more skill to hitting them on the way down.
This idea would also be very fun to see with different/more platforming mechanics!! My brain started imagining the same design but with the platforming mechanics of something like downwell, and there's a lot of different ways you could expand on the game simply by unlocking more platforming mechanics (likely of limited quantity) as you reach deeper and deeper. Bravo!