Interesting game, I like the high score system of trying to get as far down as possible, and it's cool that there's a replayable aspect to the game since you get more energy relative to your best depth, though I don't know if it feels significant enough of a energy boost to matter.
I think one thing that could make the game more fun is reworking the controls, as they feel kind of weird; Q and E to rotate probably could've been A and D, or the left/right arrow keys, as that feels more natural. There's also a lot of mechanics to control; I know the controls are listed on the side, but I think simplifying the mechanics would make it easier to play, as I only need to keep track of a few keys at a time.
Overall though, this is a really solid game for your first game jam, well done! Great job on submitting this entry!